Sorry that I am reacting so late...
I watched the demo several times but could find no suspicious moments. Mac is skilled, knows the map and on this spot the enemy can obviously come only from one direction. About the 3:19 moment, just correcting the aim is not a proof at all, and I could clearly hear the steps of the enemy before he appears, so everything's fine for me.
Sorry for the trouble, Mac. I hope you will still have fun at DSWP's