@krispy Fiction works by suspension of disbelief but logic can never be discarded.
You can accept and believe in a fantasy world where someone can cast water magic. This is called suspension of disbelief and neccesary to enjoy fiction.
But when the water that the magic creates can somehow ignite wood without any conceivable explanation whatsoever, it is no longer acceptable. This is when the logic failed so bad it stops the suspension of disbelief and the disbelief starts to ruin the enjoyment.
How much illogical things needed to stops the suspension of disbelief vary by person, but just because some of it is fantasy does not automatically makes any reason and logic could no longer applied.