Never shifted into the hummingbird form so I suppose I can do it. But my two questions remains:

a) How can I roll the bones?

b) Should I keep the hummingbird ? (have you ever had it? What's your experience with it?)

Jalim informations sounds meaningfull for someone who has Air/offense wich is not my case (I'm air/utility). If my last utility form has no punch, I'm afraid I'll be stuck with two weak top forms... I'm starting to think I should probably wait to see what is my last utility form before taking a decision on the Hummingbird.