A new microbomb type!: Keep on Running!

[Sundance]

What's to stop someone from just running into space.

Assuming space movement delays the bomb, someone could just fly through space without exploding and out the person who injected them.

Nothing.
Nothing is stopping them from grabbing booze and a scalpel and drinking and removing the implant while running either.
So the line between this being effective/cost effective and not effective/could-of-bought-a-pipebomb is quite thin.
I'd say drop it down to 1tc, and make it do severe damage. If someone is already softened up, like down to redorange, then it should gib them. That way you could do it to multiple players at once.