Present day, or near enough.
Edited to add some specifics: The pinner is an adult, in good shape, and a very old time traveler, so he can be given any kind of combat training that works. The pinnee is a skinny teenager, with no training at all; he's just flailing at random. Still, it's a situation where the pinner's going to snap into military mode.
It's indoors. The pinnee will get pinned to the floor. He's already tripped and fallen when the pinner goes into action.
So you see this isn't a huge challenge on the pinner's part. I'm just bad with choreography, and could use some aid.
Any help is appreciated!