my chameleon(he's 6 months old today)does the same thing everytime i try to take him off the pothos above his cage. ususally it works like this. i reach up with one hand he puffs up. i take my hand away. then put it back up. still puffed up he opens his mouth wide as though he is yawning then does his little shaking or vibrating(whatever you want to call it)thing. i take my hand away as he does this. wait 15 minutes go back and then he is ok. i just have to coax him off the pothos. he doesn't want to let go of it usually. this is also usually after he has been outside for a few hours. when i bring him back inside i put him on the top of the cage and when HE is ready he goes back in, but only after going up the pothos for a bit. i'm not sure if this helps at all. but you describtion pretty much matches my chameleon's action.
how old is your chameleon. you have any picture?
dennis

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working for the man again