The explosive being displayed is an inverted PROM-1.Seem to be a Yugoslavian PROM-1.
You've got all the right ideas, but not quite there. It is a bouncing betty variant, the Yugoslavian PROM-1.uhhh fragmentational antipersonnal mine that shoots 2 feet into the air and detonates?
i think it's between 2-6seconds if i remember correctly..
and safe zone...either there isn't, or it is directly above the target?