These are documented on the discord - you'd probably find it easier to find answers to these and other questions there.

In the arena before the box, you can skip the second wave by killing the 2 grunts in wave 1 at the same time, as seen here (timestamp 5:07 in the video) -

This was published after the event was over...

Funny to see a submitted run the same day the board got approved - gg!

gg! can't wait to see what you do to Hard mode

@ThatsANiceHat - it's bad sportsmanship and contrary to speedrunning ethos. This is not just my opinion - if you see the discord, the community agrees. Because of this one bad faith run, speedrun.com mods have decided to change the rules so that future challenges require livestreamed runs to be eligible to win money.

Stealth run? Kinda... interesting if it was hidden till the last minute

gg - nice run! good strat finds