Too many. Last night, I was doing the create orbs bounty in the rocket yard, cosmodrome. Wiped out the Vandals that spawn at the kings watch entrance in about 5 seconds with the last being a headshot. As the last one collapsed, I looked at it and realised at that moment I just killed 2 Vandals and 2 Reaver Vandals in 5 seconds, just to build up my super so that I could use it to kill more Fallen to create orbs. At that moment I felt sick, remorse and guilt. What if they had a partner and kids, how devastating that would be to find out that their loved one had been murdered in cold blood so that the murderer could gain power from their death to kill even more.