Yeah, I thought that, too. She was clearly flirting with Lion-O but had already long since decided on Tygra? She knows they're brothers with visible tensions between them. Not the type where the other would laugh it off with "I guess I lose this one, bro" and pat the victor on the shoulder. That's kinda mean. I guess we can attribute that error to her youth but she did initially seem smarter than that. I liked that she chose him, too, though. Sorry, your kingness, you can't have everything.
Seeing how they started off the whole Panthro thing, I picture more arm-less jokes at the poor guy's expense. I mean, he makes that big heroic sacrifice and in his next scene we have a joke with Snarf and then Lion-O's all "pfft, no one betrayed me, Dumbo" and the other two are making out. Next ep, Lion-O will be all "Hey Panthro, need a hand there? OH, sorry." Like I said, it's pretty horrifying when you think about it. Shit, both arms amputated. They have to play with jokes or that it's not a big deal and get it resolved quickly or all the kiddos watching at home will freak out and cry.
Saw this thing on tumbler though and lol'ed: