Her sister asked for a turn and she refused, said her turn wasn't long enough, the regular kid stuff. Clearly she was the dominant twin or sister because the other girl said nothing, just kept doing what she was told.
Later, when we were leaving the playground, I saw the same (dominant) sister stalking pigeons. It was creepy enough that I stood there for a few minutes, ignoring E's complaints. She had a stick or a thick piece of bark in her hand and she was slowly walking up behind the birds and throwing her missile at them. I couldn't tell if she hit any of them--they kept flying away--but she continued to follow them around the playground, again with no expression on her face. I looked around to see if her parent or anyone else was watching but I didn't see anyone. And I didn't see her sister either. She came close enough that I was able to ask, "Is your mom here? Does she know that you're throwing things at birds?"
She responded, "I like to chase them."
I said, "But you're not chasing them, are you? You're throwing things at them." She didn't say anything.
Now I am not a lover of pigeons. And I know they are disgusting birds. I saw a little kid running around, actually chasing pigeons and being delighted to see them fly away. But this girl was creepy and old enough to know better. If it had just been her annoying behavior on the swing, I would probably not have thought about her for another second. But add the pigeon stuff and I have to wonder--is she a future criminal psychopath?