A remake of an old TAS of mine    • [TAS] Apprehension train skip  
This time on default Steam version, new FPS tricks and improved reference.

Exploring the opportunity of combining unlimited velocity under water and 0ms frame object boosting. With 0ms you actually have frames enough to reach the insane speeds without interruptions. I noticed speeds well over 100k ups. And since there seems to be no velocity limitation/axis under water, any desired horizontal angle can be used without being forced into diagonal velocity that typically happens in non-water environment.
Using a 4 fps trick on the rotating doors. The door starts to open at the start of the frame even though you don't reach and touch the door until the end of the frame. Saving nearly the full frametime of 249ms compared to 1000 fps.

FPS values used:
4 - door openings
20 - water entry
100 - edgebug
1000 - strafing
10000000000 - ducktaps and object boosting


Half-Life TASing Introduction v2:    • Half-Life TASing Introduction v2  
Download Bunnymod XT: https://github.com/YaLTeR/BunnymodXT/...
Half-Life Physics Reference: https://www.jwchong.com/hl/

Footage of the hltas execution captured live with: https://github.com/YaLTeR/bxt-rs
As always, a big thanks to ‪@YaLTeRz‬

0:00 Water script: https://pastebin.com/DZjs7gPQ
0:13 Train script: https://pastebin.com/J3SMcavi
0:28 Slowmo splitscreen


Timings:
12,260 under water 41|0
12,424 tram route 85|15
13,9 old water route TAS

The result speaks for itself; only 0,164s faster with a great loss of health.
Worth noting is that going in the water all the way until the grenade boost is about 0,2s slower than going up the stair. But this was the way I found to work without any armor for minimun damage.

Trivia:
The train HUD shows only three of the actual four gears.