Early game · first 8 minutes
Take cover between bursts of gunfire so Infernus cannot keep building Afterburn. Step out of Flame Dash’s trail before returning fire.
Rat King vs Infernus
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Mid game · Walkers
Wait for Flame Dash to end before chasing with rats and gunfire. Consider healing reduction if his recovery keeps outweighing the damage you deal.
Late game · Patron
Spread out and move away when Concussive Combustion starts. Slamming your banner down can knock Infernus up, but it will not stop Concussive Combustion once he has activated it.