The Tyson soft lockdown must be the most hilarious lockdown in the entire game. It's obviously messy and there's a lot of randomness to when it happens and where guards will decide to go, as well as possibility of Tyson walking instead of running to the spot behind cinema screen. It's likely applicable for full game poison% runs though, most of the time his guard follows him, but is a bit behind, and if a guard walks in front of him, he won't notice Tyson die immediately. I aimed at placing 2 shots above windows at 1:27, not sure if it's important.

Throughout all the attempts i assumed that panic on doctor allowed the body to remain unnoticed until ~2:23, and sometimes it was ~2:18, but then i tried to replicate everything up to 1:30 in-game time, return to doctor's hut and found out that it's inconsistent when the panic ends because of all the chaos happening on the map. Game still works like a clock. If you want to hide Ljudmila, you can shoot earlier, go through the stairs and kill her at 12 next to the box.

Putting Steven in lockdown 1-2s later made him alert his guard for whatever reason, but maybe it's because of his pull-up cycle, so watching some cutscene and doing that kill may be possible. Tranq instead of blinding darts is viable.