[@BCTheEntity] *shrug* Look to the GM. It is within his purview to control NPCs. It's supposed to be up to him to keep a certain level of balance within the world by ensuring things don't become so lop-sided that they get boring.

That said, don't place blame on others where it can fall on you. Lucius didn't have to intervene in the surgery. In fact, even with the ogryn on his side, facing three armed and armored marines carried a heavy chance of failure. The indoctrination into the Adeptus Astartes, especially before the fall, placed much less of the stereotypical fanaticism that modern marines have pointed towards their chapter. Their dedication was to their Emperor, and the imperium. The idea of letting another marine die, especially one that he did not know personally, shouldn't cause him to do something stupid like force a fight against a superior force, especially when in a situation with as uncertain an outcome as the one the group is currently in.

tldr; JB is kinda slacking, but you brought it on yourself.