User blog comment:VedranTheII/Pretentious Diaries 1: Are my semblances worthy?/@comment-25555436-20150628140859/@comment-25555436-20150629211027

It's not so much retarded as much as lacking. There are thousands of things we don't know about RWBY simply because Monty and co. fucked it up at world-building and exposition. WoR only spoke about what we already knew and barely anything new, but nothing useful.

It's just a theory ATM, but some think she needs to touch objects before being able to move them. There's nothing that shows her control over an object stopping after some time or anything that would prevent her from controlling it, other than her apparently needing to touch X to move X. An understandable limit; otherwise she could just pwn everyone like a freaking jedi. It's not as fun when the fight is sooo one sided.

Regarding the cans, she hit the floor which seemed to cause a shockwave of sorts which did touch the cans. I guess that's another way of applying the condition.