Food aggression?

I was trying to take a cute video of my rats choosing their favourite treat among various things, when Popcorn(grey, usually VERY sweet) kind of went off on Sophie(black and white) after she finished her treat and tried to grab Popcorn's. They are usually very close and love play wrestling with each other, but this was pretty different. She seemed pretty angry/annoyed. No one was hurt, but it was still pretty alarming. You can see Popcorn start fighting with her again when she goes to grab another treat. Is this normal or cause for concern?

Additional info:

They have been together for 2 months

Popcorn is about 7-7.5 months old and Sophie is 3.5 months old. I'm guessing Sophie is going to be significantly larger than Popcorn before long.

All of them are guilty of stealing treats, but Sophie is pretty notorious for it

I put away the treats after this video and they seem fine and aren't fighting any more, but I feel worried 🥹 never experienced anything like this