I think Angel did the right thing. . . for the most part. He could have wound up killing a few innocents instead of annoying some brass and royalty. But, when someone throws a grenade at someone else they have the options to; stand still, dive for cover, or get rid of the grenade. Since standing still is very stupid and gets you killed it's the last thing our heroes will do. As I recall they were in a corridor, a place that doesn't accomodate much dodging, Leaving the option to get rid of the grenade which Angel is very suited to. No, they screwed up by being seen. I wonder if one of them actually has some way to make themselves beneath notice and just forgot about it. That sounds vaguely like something they would do. Definitely something I would do playing video games.

It wouldn't surprise me if Darkmoon had managed to cultivate a skill like that. Golem's magic doesn't seem to work that way and I think Angel is a little too full of himself to even check to see if he had that power.