I thought you had to run in and out to get them to dorp the bomb.
The more people that are closer to the bomb when it's tossing it the higher the percentage of chance it'll drop! true story
I don't give a fuck if it's stupid, I still run into their hand as they're about to toss it.
It is really helpful if the mob happens to be moving, or if you have many mobs you can bounce it around to make a better path
i first noticed it in campaign where the nms that gravityga generally bounce hate enough to always be moving, so you can swing around to right where they were going to be