Board Thread:False Info and Speculative Discussion/@comment-32859958-20160427180330/@comment-26879545-20160428162930

^ That's wrong, actually.

Peter (The Alpha) wanted Scott to kill because it was supposedly his pack initiation thing. According to Derek, the Alpha wanted Scott to kill with him. If Scott refused to kill, which he was refusing to do the entire season, the Alpha was going to kill him.

In Night School, the episode I assume you're referencing, he (the Alpha/Peter) tries to force Scott to kill them, yes. However, it was Scott's speculation that they were targeted because they were his "old pack." Considering Scott and Jackson's relationship was antagonistic from the beginning, it's unlikely Jackson would have been considered pack at any point in the series.

From Peter's perspective, he wanted to trick Allison into going to the school so he could have Scott kill her and Stiles (aka: The two people that kept him "human"). In order to do that, he had Jennifer (the Nurse, IIRC) send a text to her; essentially telling her to go to the school. Lydia and Jackson just happened to be with Allison. A "wrong place at the wrong time" situation, if you will.