I am not really convinced that Kate will succeed in turning Scott into a Berserker. In the midseason trailer scene with Peter Scott looked normal and isn’t according to legend being a Berserker a kind of possession by an all consuming animalistic rage? This is something Scott has struggled with all season and has also overcome on several occasionsW what Peter tried with him in season one is not entirely different so Scott is not exactly unprepared and he is able to fight it.
And if Scott really gets temporarily consumed by this rage I can totally see a repeat of his nightmare about Liam happening, but this time with a different ending.
I am pretty sure Liam will join the others on their trip to Mexico ( I saw a set photo of Tyler and Dylan where Tyler wore the same clothes as in the final fight with Peter) and if Liam came up against Berserker!Scott I am pretty sure this horrible dejavu, the similarities of such an encounter and the sequences of Scott’s nightmare about Liam could be so shocking for Scott that he probably would snap out of it. It would also an interesting plot twist for Liam to face his Alpha while he is also a Berserker, his greatest fear.