The context of the following conversation is Austin was vindictive and a grudge holder, so he sent Kendall off to war.:
Austin says So you know that gang war I've been telling you about?.
The friend responds What about it?.
Austin responds Well I'm a lieutenant in my gang now so I get to decide who has to fight in the war..
The friend responds Who are you going to choose?.
Austin responds Well Kendall beat me up in my initiation when I first joined the gang so now I can send him off to war..
The friend responds You're a vindictive grudge holder..