For people who know the Smallville series...?

I just saw an episode, and I don't watch the show at all but it was the one where this shape-shifting being they called "Tina" was impersonating Lana's old boyfriend, who was actually dead, in order to get close to her. I thought it was really good, but I have a few questions:

1.) Who, and what, was "Tina"?
2.) And why was she so obsessed with Lana?
3.) And about Clark Kent, when he fought "Tina" how come he got knocked around? He's Superman after all!

1) Tina Greer grew up with Lana in Smallville. She had some kind of soft bone disease when she was a child and she was treated and cured with Kryptonite radiation. So she had the ability to shape shift physically and it gave her superhuman strength.
2) She was obsessed with Lana first because she was jealous of her and wanted to be her. Then she realized that she was really in love with Lana.
3) The reason that Tina was able to kick Clark's butt at first was because she was fighting with Lana's Kryptonite necklace.

FYI--Tina comes back in a future episode and that one is really good too! I won't ruin it for you but it was good.

Tina is agirl that was affeted by the meteorite shower and got the ability to shape shift. i think she was a lesbo becasue she was talking about how much she like Lana and she deserved to be with her. the reason clark got knocked around was because when Tina shape shifted into Clark she also copied his powers and thats how she got so strong.