"Video "starts" at 1:30.
Video "ends" at 1:13:51, when Fast Travel unlocks.

I spend the first 1:30 setting everything up, including showing that I've unbound the chainsaw. After 1:13:51 I traverse the level for ammo still on the ground. I could have done so much better than I did here, but I don't feel like doing a "no chainsaw" run again for this level."