Use the frag grenade as a proximity mine
From Create Your Own Story
You tag the frag grenade to the wall,now you go to the window and snipe, you spot 3 humans, a generic COG gear, but wait a second, you recognise the other 2, Dom Santago, and Damon Baird,they were 2 of the humans who helped in the lightmass bombing of the locusts original home, dom even was one of the 2 humans who slayed the old locust general, General RAAM, YOU HATE BOTH OF THEM, so anyways, who do you decide to pick off first, before you end up being spotted.
