lighting A Tight Situation! Using a Backlight Indoors

I'm not really very good at using lighting - in fact, a lot of my previous efforts with a camera have always been scrapped because I'm just incredibly terribly at lighting scenes properly (and I'm a tad obsessive about the quality of shots). For my first, proper short film, I decided to actually look up how to properly light a scene, and I came across the "three-point lighting" system.

Now, it's all well and good, and I understand how to set it up and why each of the lights is needed, but looking over the current scenes for the short flick there's one in a small bathroom. The problem with this is the position of the actor - he's meant to be against a wall, in the corner of the room, and I can't seem to fathom where I could place a backlight for that shot.

Would I set it up elsewhere and bounce the light off of the wall / objects? Would I have to just use some sort of awkward angle? I could just shoot it with the current idea of having the camera low to the ground and the light placed basically on the wall behind him and angle it, but I'm just wondering if there's some other way I haven't thought of.
 
My best advice - three point lighting is a technique, not a rule. You should do what looks good and feels right for the shot, and it doesn't matter if you don't light everything in the same way.
 
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