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The only thing I can think of right now (without looking at the files) would that there might be a Reaction in the State_Manager that has a higher priority (if it has reactions). Otherwise there doesn't seem to be anything obviously wrong with it.

That being said, character/item scripting is still a murky subject for me, so take my words with a grain of salt. More so since I'm not able to look at the files that the game uses right now.

Edit:
From what I can tell there are no preset reactions per se; you need to define them yourself. You can take a look at other charScript files to get a better feel of how reactions work. I suggest looking at the SkeletonKing and SkeletonQueen charScripts, since they switch their behaviors quite a lot in-game depending on the situation.

If your guard is using any other scripts, they might have a reaction with a higher priority as well.