Unless he is...like 5" long...he's likely very harmless. The worst he could do would be to take out a hermit crab or something. You're lucky you didn't do him in while trying to get to him.
My experience is that a very small pistol can make a very large noise.
Too bad you are in Calgary, he would be welcome in my tank.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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