Ehh, I mean, they already know there is a fire and that fire getting bigger is something they anticipate one way or the other, but an explosion could take them

Ehh, I mean, they already know there is a fire and that fire getting bigger is something they anticipate one way or the other, but an explosion could take them by surprise. I suspect that more people are killed by big flames than explosions, but more fire fighers are killed by explosions than big flames.