"If fighting will result in victory, then you must fight! Sun Tzu said that! And I'd say he knows a LITTLE bit more about fighting than you do, pal, because he invented it!"
I really love the dynamic these two have. They're just the broest of bros. 100% looking out for each other, caring for each other. No hidden motives, nothing weird, just "Hey my bro is suffering, I'm gonna help. You're my bro and I'll always look out for you."
Yeah it makes sense how it happened, I just didn't realise the author was showing him collapsing because of a serious reason rather than just being overcome with horniness.