When Space Marine 2 has a brain fart...

A weird glitch with checkpoints that persist through death, and forces you to restart the entire mission. Something similar happens in other missions too, but here it just hard locks you to failing the boss fight. The boss during this phase just became completely invulnerable after like 15 failed attempts. Pretty fun game, but for 100 bucks this doesn't feel right. :D
Video contains a run of how it's supposed to work, then a demonstration of what's going on when it just refuses to work.
Remmember when you game, take it easy!