Isa 6:6 NKJV
Then one of the seraphim flew to me, having in his hand a live coal which he had taken with the tongs from the altar.
This was a live coal from the altar.
On the other hand, (NIV) Ezekiel 10:
1 I looked, and I saw the likeness of a throne of lapis lazuli above the vault that was over the heads of the cherubim. 2The Lord said to the man clothed in linen, “Go in among the wheels beneath the cherubim. Fill your hands with burning coals from among the cherubim and scatter them over the city.” And as I watched, he went in.
These coals were not from the altar.
6 When the Lord commanded the man in linen, “Take fire from among the wheels, from among the cherubim,” the man went in and stood beside a wheel. 7 Then one of the cherubim reached out his hand to the fire that was among them. He took up some of it and put it into the hands of the man in linen, who took it and went out.
This fire was not from the altar. It was among the wheels beneath the cherubim.
A cherub took fire in its hand in Eze 10:7. Why did a seraph in Isa 6:6 need tongs for red coals?
They were different kinds of fire. Isaiah 6:6 involved the fire from the altar. Ezekiel 10:7 involved the fire among the wheels beneath the cherubim.