He started to come after Chuck as much as Sarah after Chuck foiled his plans to kill Sarah and shot him “dead”. But, he REALLY came after Chuck when Chuck foiled him the second time when he outed him as a Ring agent.
Even when he was a good guy Shaw had quite an ego. Chuck was his student. It really hurt his ego when the student outdid the master. In this episode, it looks like Shaw is still trying to be the Alpha male and prove he’s better than Chuck.
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