Heaven is Involved pt. 3

There are Angels that are given to guard the righteous from harm. During all of the calamity in 3 Nephi, it was the "more righteous part" of the people who were spared. It said that they: 

"received the prophets and stoned them not; and it was they who had not shed the blood of the saints, who were spared— And they were spared and were not sunk and buried up in the earth; and they were not drowned in the depths of the sea; and they were not burned by fire, neither were they fallen upon and crushed to death; and they were not carried away in the whirlwind; neither were they overpowered by the vapor of smoke and of darkness.

And now, whoso readeth, let him understand; he that hath the scriptures, let him search them, and see and behold if all these deaths and destructions by fire, and by smoke, and by tempests, and by whirlwinds, and by the opening of the earth to receive them, and all these things are not unto the fulfilling of the prophecies of many of the holy prophets."(3 Nephi 10:12-14)

Here is an account of a dream Joseph gave:

“In the evening I attended meeting in the Seventies’ Hall. George J. Adams preached and I made some observations afterwards, and related a dream which I had a short time since. I thought I was riding out in my carriage, and my guardian angel was along with me. We went past the Temple and had not gone much further before we espied two large snakes so fast locked together that neither of them had any power. I inquired of my guide what I was to understand by that. He answered, “Those snakes represent Dr. Foster and Chauncey L. Higbee. They are your enemies and desire to destroy you; but you see they are so fast locked together that they have no power of themselves to hurt you.” I then thought I was riding up Mulholland street, but my guardian angel was not along with me. On arriving at the prairie, I was overtaken and seized by William and Wilson Law and others, saying, “Ah, ah! we have got you at last! We will secure you and put you in a safe place!” and, without any ceremony dragged me out of my carriage, tied my hands behind me, and threw me into a deep, dry pit, where I remained in a perfectly helpless condition, and they went away. While struggling to get out, I heard Wilson Law screaming for help hard by. I managed to unloose myself so as to make a spring, when I caught hold of some grass which grew at the edge of the pit.”

“I looked out of the pit and saw Wilson Law at a little distance attacked by ferocious wild beasts, and heard him cry out, “Oh Brother Joseph, come and save me!” I replied, “I cannot, for you have put me into this deep pit.” On looking out another way, I saw William Law with outstretched tongue, blue in the face, and the green poison forced out of his mouth, caused by the coiling of a large snake around his body. It had also grabbed him by the arm, a little above the elbow, ready to devour him. He cried out in the intensity of his agony, “Oh, Brother Joseph, Brother Joseph, come and save me, or I die!” I also replied to him, “I cannot, William; I would willingly, but you have tied me and put me in this pit, and I am powerless to help you or liberate myself.” In a short time after my guide came and said aloud, “Joseph, Joseph, what are you doing there?” I replied, “My enemies fell upon me, bound me and threw me in.” He then took my by the hand, and drew me out of the pit, set me free, and we went away rejoicing. (June 13, 1844.)”

He speaks of this angel as if he knows them well. He didn't say "there was an angel with me" he said "my guardian angel was along with me."

I imagine this is how Alma and Amulek were able to survive the prison falling to the earth around them while everyone else was crushed in Alma 14:

“And it came to pass that they all went forth and smote them, saying the same words, even until the last; and when the last had spoken unto them the power of God was upon Alma and Amulek, and they rose and stood upon their feet. And Alma cried, saying: How long shall we suffer these great afflictions, O Lord? O Lord, give us strength according to our faith, which is in Christ, even unto deliverance. And they broke the cords with which they were bound; and when the people saw this, they began to flee, for the fear of destruction had come upon them. 

And it came to pass that so great was their fear that they fell to the earth, and did not obtain the outer door of the prison; and the earth shook mightily, and the walls of the prison were rent in twain, so that they fell to the earth; and the chief judge, and the lawyers, and priests, and teachers, who smote upon Alma and Amulek, were slain by the fall thereof. 

And Alma and Amulek came forth out of the prison, and they were not hurt; for the Lord had granted unto them power, according to their faith which was in Christ. And they straightway came forth out of the prison; and they were loosed from their bands; and the prison had fallen to the earth, and every soul within the walls thereof, save it were Alma and Amulek, was slain; and they straightway came forth into the city.”

Angels are not to be worshipped, or even approached for guidance(Rev. 19:10), but they are sent to minister when we go to God for guidance and help.