During his rampage through destiny, he managed to take down 5 marines, killing 2 of them, and managed to wound 3 more military personnel on the planet.
The entire Lucian Alliance Incursion ended with only a few wounded military personnel and 2 dead marines.
The crew seemed to have suffered more casualties from one Lucian Alliance soldier than they did from a whole invading force of them.
That seems that a pretty unrealistic contrivance to further a story that honestly shouldn't have happened.
Seriously, it was ridiculous how quickly those marines were being dropped by a single guy with a pistol.