A buff to CFL3 and thermite (and mabye other fire chems)

[Roomba]

If someone runs around smoking those two they're probably going to die by the second.

Unless you use beaker bombs/have fire resistance/are in a pod/drag a closet around/are a borg/at least several dozen other mitigating measures I can't recall off the top of my head.

Heck, I've seen someone last an entire round smoking CLF3/thermite nonstop with just a fire suit, some burn meds and an extinguisher.