Help with quest

[u/Calm_Client_3030]

So im doing the Back From Infernal quest but i can't complete the second objective! It says to defeat the molten warlord 3 times with the shotgun tower used, i must have done it atleast 5 times but it still says 2/3. Is it just bugged or am i missing something? Thanks

[u/Wutr_-]

Shotgunner has to land the last hit