Stygian boss can glitch

[Superbuu3]

First try in Armageddon I was shooting this guy for 30 mins then died and stopped playing for the night. Then booted up the game the next day I killed it in under five minutes doing the same thing. Btw I had the gun upgrade. I am aware range appears to effect damage. This is just a heads up in case someone wastes an hour thinking but I put this much time into it I can't quit now xD.

[KatzenSebi]

I am playing it right now. I had no problems. You must remove the muzzle with your sword. Only then can you damage the mouth. Later in the fight mini worms will appear which you have to defeat first before you can shoot at the big worm again. Took me maybe 10 Minutes for the Fight.