Next time, if a similar occurrence takes place, do this:
Catch the thing from your attacker, then keep it under your seat (Make sure no one else sees). make sure to keep your legs in front so that an extra layer of concealment is added. All good? Now ask for snacks from the attendant. After you’re done and still hungry, that extra pack under your seat will do great! (Plus, the offender has a low chance of getting their food back as one, the attendants don’t know where it is and two, i’on think the staff will give them a new one.)