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In video games, a monster that only attacks when your back is turned
Needs a Better Title. Up for Grabs. This appears predominantly in Platform Games. It's a creature that looks perfectly cute and innocuous while your character on-screen is facing it. Possibly it even looks like a rock or other terrain feature as camouflage. Then, if you turn your back on it, it'll move forward and attack you when it gets close enough - unless you turn back to face it, in which case it goes back to looking innocent. For example,