I WOULD attack with lightning, but...yeah, probably not wise.
SO instead, I reduce their heat so their fire goes out, and their wooden crossbows are messed up. THEN I allow them to rapidly reheat. Perhaps that'll do some damage.
If not I'll just keep repelling heat from them, freezing them to the point I can shatter them. Though doing that will suck for my energy reserves...
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)