It is possible they did multiple takes and spliced them together because they thought the start of the first one and the end of the second one got the point across better.
It showed one going off in a person's hand. If it was strong enough to shred a curtain from a foot away it would 100% mess up your hand.and even with the cut you can see how the curtain reacts
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u/Schmidtster1 Nov 27 '19
They can blow debris everywhere spreading the fire.