Klein's lit up at that. If others are obsessed with being the bigger person and they can easily forgive, he is the exact opposite
He always makes sure that everyone that wronged him would pay. In Klein's perspective, in the first place, he wouldn't need to forgive if a person did not do something bad to him, right?
But of course, this was only on the 'medium to big things' and it also depends on his mood
Minor things that don't have much effect would be ignored by him. However, if it was, for example, bullying especially just because of his sexuality, he surely would avenge himself
Calix 'setting him up' is also something that Klein considered as big. Thus, he wants that guy to endure the consequence
But there is one problem with that. "How are you even sure that he'll help us?" Klein asked doubtfully
In his eyes, Calix is the epitome of evil. He doesn't believe that Calix will help him even if this was his fault