I have to say not all PM eat humming birds there are several different type and some never get large enough to capture a hummer, they can do a lot of good in the garden also.
As for biting they do not have a mouth part large enough to bite, if you were hurt by one it was probably by the spurs they use to catch and hold their prey. I have kept PM as pets and they are quite interesting creatures, the only agerssive ones are the males and during breeding season they about have to in order to survive.
I think they are getting a bad rap here
This one never gets longer than 2''
