the medic has a infinity pack

Spy is "board".

Board is spy! Heavy is distraught.

Spy is disguised as a board. Unfortunately for him, Heavy has already found out that he is a spy.

heavy is suspicious of a spy disguised as a razor blade

Heavy Titan caught a tiny BLU spy in disguise (I can't see what it is sorry!)

Heavy grabs a tiny (most likely) spy into the air. The spy yells , "Mon dieu!"

Not-so-Heavy tossing Spy's outline that shouts "Mon Dieu!"