punch in the belly, and then finishing punch with both hands from above!

Or 1. Leg grab, push it up and kick in da head (like from God of war, ya know)
2. Grab the head, smash it on the floor and final kick!
3. Saw the idea in main comments, headcrab kicking like football ball

rip heart ?

How bout this You kick them in the shins then as they clutch there leg you grab them by the arm and throw them over your shoulder breaking there spine. also another thing if you glory kill someone while holding a crowbar it will play a glory kill with the crowbar here are some ideas.1 facing them from the front.
you stick the crowbar in there head then kick them in there chest ripping the crowbar out and sending them onto the floor killing them. 2 from the right side of them. you hit there leg with the crowbar then you walk over and stick it in there head finishing them. 3 from the back. you sneak up behind them then with 2 hands lift it over there head and hold it in front of there neck choking them as they struggle to break free you kick them in the back breaking there neck and 4 from the left. you swing your crowbar to the right and stick it in there chest then while you hold it with 2 hands you lift them over your head and slam them into the floor killing them. and those are some ideas also keep up the good work i love glory kills and your one of the few creators who put time and effort into putting glory kills in Garry's Mod thank you!