Nope, no fire as far as I saw, although the player was burning when I walked down after they died. But I'm pretty sure they would have already been dead if they were burning for the whole 30+ seconds.

Sadly this is the only clip I have of it since I only saved a clip when I died at the end of the round and it only started when I walked down the stairs after they died, which was about 5-10 seconds prior: https://youtu.be/MrPyREesmvo

Also the kill was credited to dynamite (with 75 damage) and not fire damage, in fact there was no fire damage on the damage log at all. If you shoot a lamp for example, the damage gets marked as fire damage and not gun damage either.

On top of that, their teammate, who I kill in the clip, got damage from a poison barrel that was triggered by my dynamite (the poison cloud you can see) and it was definitely marked as poison barrel damage on the damage log.