Like this.
1) After agent hostages, go downstairs. Kill 1st taker, skip 2nd. Defuse bomb, warp pipes, diffuse other bomb, kill taker quickly, finish.
Best I got here was 102. The 1st basement hostage, I only timed 3 times so far, he takes 40-50 seconds, but I think he can do less. You release him at 32ish seconds, so you would him to escape in 30 for complete. Killing the brige guy from outside always gives 6 second escape. From inside, the best is a bit more. This one has a chance of working.
2) Kill both basement hostages, diffuse bomb, warp, diffuse other bomb, leave. I got 101 and 100 here on just soso runs. You release the last hostage at around 35 seconds and he takes 50-100 to escape. So no way this works