"Hey--!" Catra's indignant objection comes too late, and though she wraps her hand around Adora's wrist in a flash she's not quick enough to prevent the disappearance of the berries.

That's not going to stop her from grabbing Adora's jaw with a growl of disbelief, squeezing her cheeks to pry her mouth open. If Catra does not get to eat those berries, then Adora does not get to just go ahead and do it without a fight.