Laminator_X
Once & Future KMC Hawkeye
I really liked him offing Attuma. For one, I never really liked Attuma. Second, while the Sentry generally follows the "Super-Hero Code" or whatever, while hundreds of people are dying every second he's not going to waste time posturing or show mercy in the middle of a "hot war" situation. Finally, that was our first glimmer of the "Golden Gaurdian of Good" schtick being just that, a schtick. Rob puts on those airs not just for the world, but for himself as well.
He could have gone for an instant takedown against Attuma, but since he on some level knew he could get away-with/justify it, he took his head off.