Sam looked incredibly hot in this episode...and I loved seeing him so badass killing the vamps! AND using the Colt on the alpha vamp (more on that later, too)!
It was really bugging me how unlikeable they've been making Mary, the way she went behind the boys' backs and lied like that. I was glad they confronted her in the beginning. Dean was so pissed off, he even started referring to her as "Mary" instead of Mom. And her rationale for working with the British MOL...she wants the world rid of monsters so the boys can have a normal life. I don't know what to think of that. On one hand, I can understand her being involved in that life and not wanting that for her kids (although hadn't John said the same thing to them at one point? I think at the end of S1 he told Sam he wanted him to go to school and he wanted Dean to have a home...and also in IMTOD he told Dean he put too much on his shoulders and made him grow up too fast), but as Sam said, he chose this life.
And then after that we see Dean in Classic Dean form, trying desperately to find a case to take his mind off this. Sam seems to want to give Mary a chance, but Dean is still pissed. I felt so bad for Sam when Dean accused him of trying to be the peacemaker, first with Cas and now with Mary, and then tells him to pick a side.
Sam does meet with Mary and leaves Dean a note that he went out. He gets to see the BMOL's operations. Meanwhile, BMOL Ketch drops in on Dean, has a drink with him and gets him on the vamp case.
The BMOL might think they're cool with their way of doing things, their micromanaging etc, but it turns out they're pretty piss poor with actual fighting (not to mention security). Guess they didn't really count on what the alpha vamp could do. And what a weird twist that that hunter guy turned out to be working for alpha vamp. Speaking of which, it was awesome seeing him again - Rick Worthy always did a great job with him. Needless to say I was sorry they had to kill him off. It was a pretty nice touch though that Sam and the other BMOL guy kind of teamed up to get the Colt loaded with the bullet.
As pissed off as Sam and Dean were with Mary, it's obvious they still loved and worried about her. I thought Dean's excuse at the end, about how he was worried about Mary seemed kind of...forced, almost unbelievable. And I wasn't too thrilled that he didn't say anything about being concerned for Sam....though, Sam did say that Dean didn't know he was there. Maybe I'm missing something...
I'm kind of worried there will be more friction between the boys now, especially when Sam told the BMOL guy that he's in and when asked about Dean he said "...Give me some time." Is Dean going to have a huge problem with working with these guys? Is it going to be Sam and Mary vs Dean now? I guess I'm getting ahead of myself and should just wait and see what happens.
Again the highlight of the ep for me was watching Sam kill all those vamps. Woo-hoo :D