When she was being dragged to the vehicle, something metal fell out of her pants. Someone speculated it might be a battery. Now that a brain stimulator has been mentioned, such things probably run on batteries.
Related:
Go to the part where illary is propped up on the concrete post.
Watch the lady next to illary in front of the lady in blue.
Right before grabbing illary under the armpit, she throws something out of her right hand .
https://www.youtube.com/watch?v=q5mYx5oCxEg
Is that right before the ‘metal object’ lands near illary’s foot?