To be honest, I kinda had a similar WTF face myself the first time I saw Kyubey do that.
(And for some reason, I always envision that he tastes like cotton candy to himself. It seems the perfect extra added note of creepiness.)
MAMIIII!
KYAAAAAA!!
Tomoe Mami learned a new magic (binding magic).I should probably stay silent about things with this girl...Though she's talented.Geez, always having your composure is a key to continuing being a puella magi...