Rewatching Flash v Bisu game 1... why doesn't Bisu have a unit or two in front of Flash's natural to spot the move out timing? Just seems like a mistake to see it so late like he did in game. I'm sure there's a reason...
because map can be mined by vultures at that stage of the game. So after chasing the 1st vulture and after mine upgrade finishes, protoss waits for an obs. Even if in this specific game there weren't any mines, there could have been.
![[image loading]](https://i.ibb.co/pBk4pVg6/75-CEB31-D-A18-B-4952-9-D59-770-CFAB395-C2.png)
