Stiles and Lydia's chemistry is just amazing. Those two have developed so much over all of the episodes. Just watched 1x11 when they went to the dance together. The way they need each other and how well they work together is incredible. These two never stop impressing me.
I enjoyed the action in this episode. A lot of really cool stuff and we got to see a hint of our old Stiles back. He is joking a little bit more than he has been in a while. He was so far gone, so angry for so long that we lost who he was. I think he is slowly coming back and that is because the pack is coming back together. With Lydia back, he can finally relax again.
They really do tie it all together.
Their relationship is truly amazing. They are always the only ones that don't hate each other when everyone else does even if they aren't together, their friendship is stronger than most of the friendships there. Even when Scott and Stiles weren't talking to each other Stiles wanted to talk to Lydia. They really save each other.