Crab Killer? UPDATE: CAPTURED + with pics

[spawn]

Okay, now this is bad. I set up a trap, a glass with the zoa's about half way down inside... baited with his favorite zoa's (luckily the only one's he's eating) we're just watching TV and guess who is looking hungry again. This crab is only about the size of a quarter, & he's eaten probably 15 heads today already. So he's sitting on the edge of the glass trying to size up the situation, & very weary of it all. He wanted them so bad, he started to pinch & move the edge of the glass before backing off like it was to risky to try going for them. Now is it just me who thought crabs were not smart or is this guy just srcewing with me. There is obviously worry on his part about the smoothness of the glass, it was like he didn't feel safe leaving the rough surface of the rock. Has this happened to anyone else???? WTF