
I mean idk if he tried to ki** himself or was just tired, but it doesn't make too much sense. 1. Drowning is one of the most suffocating way to go
2. If it was mix of tiredness and drunkness I won't believe he wouldn't get at least a little bit of shock and wake up when going into cold water.
Also it's hard to believe that the person who tires to help people so much would go to work in that state and risk hurting his patients.

I do agree that this fight looks rushed, but it might be done like this on purpose. To end the "war" chapter, but also to show, that the fights which earlier were taken so seriously now can be executed the very same day. Because they're not the main focus point anymore, and also because Jiwoo grew mentally and physically. Wouldn't be too shocked to see more calm site of Jiwoo too keep up with Kayden reputation.
First you drive a car with only one hand available (very good idea) and then you carry our baby like a sack of potatoes