Jacob wrote...
I think she is going to shoot her to show that her shields aren't working properly.
I believe those shields can only be used while under the effect of a striker unit. (Remember when Yoshika put on her striker unit for the first time and tried out the shield, where Mio said she'd be talented, or something like that?)
Also, unlikely. 'Hey, your shield's getting weaker. *Bang.* See?'
But you're right, there was that part with the broken shield. What's up with that, I wonder.