Daniel is sick for days after Gabriel visited him showing him visions.
King James Bible
And I Daniel fainted, and was sick certain days; afterward I rose up, and did the king's business; and I was astonished at the vision, but none understood it.
Isaiah was awake when he saw this vision and the hot coal was placed in his mouth.
The Angle`needed tongs to handle this hot coal so obviously it hurt and Isaiah could've been burned, but instantly healed or just stung a slight bit of pain.
Isaiah chapter 6
Isaiah's Vision of the Lord in His Glory
…6 Then one of the seraphim flew to me, and in his hand was a glowing coal that he had taken with tongs from the altar. 7And with it he touched my mouth and said, “Now that this has touched your lips, your iniquity is removed and your sin is atoned for.”
Gabriel embraced him.to show he was not dreaming . If you looking the bible an angel wrestled with Jacob and broke his hip. So what is worse breaking a hip, or a hug from an angel?
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Isaiah hot coal was put in a prophets mouth and that hot coal touching his lips removed his sins without Jesus Blood, so even Angels forgive sins using hot coals.