First of all, the hardest 2 player coop speedrun record we set was rejected, so I'll explain it.

i got a objection for your decision.

before i explain this i have to write about rank system.

the rank system is auto difficulty adjuster (or it called dynamic difficulty adjustment).

it isn't shown in game screen but it keep increasing when you are not dying or complete stage.

when the rank is high the enemy hp will be increased, player hit damage will be increased.

the reason for brenda hp gauge not showing green is that

we killed stage 1 boss too fast by using bug then we meet the brenda in stage 2.

since rank system is NOT HIGHLY ENOUGH to show green hp gauge

the brenda hp gauge show yellow.

if you still can't understand what am i saying then keep dying as much as possible. then meet the brenda.

you will understand what is the rank system it is.

1. 'Not' Use Bug kill Stage 1 boss and next stage 2 brenda engergy bar(top video)

2.'Use' Bug kill Stage 1 boss and next stage 2 brenda energy bar(bottom video)

By the way, this video was also set to hardest difficulty and speed-run, but because I caught the stage 1 boss in an instant using a bug, I entered stage 2 with a low rank, and Brenda's energy bar is not green again.

In other words, staticsphere and I just used a bug to catch the stage 1 boss in an instant, so we kept the rank low, so Brenda's energy bar didn't come out green when we went to stage 2. So we obviously played with hardest difficulty.

1. Normal Difficulty

2. Hardest Difficulty(Use Bug kill with Stage 1 Boss)

3. Hardest Difficulty(Not Use Bug kill with Stage 1 Boss and Green energy bar brenda)

Your thesis is interesting, I tested what you say here, and you are right. I tested it with @FX_Kurama on the mame plus plus 0.119 emulator

Brenda's life bug worked with hitkill Dolg!

Please avoid using emulators in Korean translations, we Westerners have difficulties with their language. Also, GotVG is an emulator that usually modifies roms and games to adapt them to emulation, avoid using this emulator for runs here

Finally, you could post the bugs and glitches you used in the run, to avoid being rejected.