Board Thread:False Info and Speculative Discussion/@comment-25038237-20150707204956/@comment-26601629-20150709193550

All of that would indicate pre-planning, knowning he was going to lose, and that he was going to die. Meanwhile, we know the reason he bit lydia was simply to get stiles to help him. Now he mentions to lydia that she was hi back-up plan and this IMHO is another inconsistency on Teen Wolf, he clearly was going to let her die in the episode he bit her, and if stiles hadn't begged him and agreed to help him, he would have let her bleed to death. He even metions that she was either going to die or become a werewolf(I guess the concept of the shape you take reflecting the person you were had not been established at this point).