[NanbanJim]

"We" don't necessarily understand what a traditional hasty ambush is. I don't think that's quite what this is, either... but I don't see what the confusion is.

There's an extended engagement. There is a lull in the fighting--maybe both sides feel they haven't got the ammo to keep wasting it, who cares, doesn't matter why, there just is.

Instead of staying essentially in the same position to do other tasks or completely withdrawing, you redeploy to cover expected enemy positions/avenues of approach to the best of your tactical knowledge.

If the other side has someone watching you guys, then they try to figure out where you're going. Essentially if you confuse them enough to where they don't quite know where you'll be, you may be able to now get the jump on them. If you don't, that means they have observed or predicted where you are.

If nobody opens fire, then the presumption is that the other side has had time to figure out where you'll be, and you have to try that again.

Note that you can use Operation Actions in place of Tactical Actions at a penalty, so yes, this isn't a Field-Manual, doctrinally proper "Hasty Ambush" so much as it is maneuvering in combat... you can do it during the hectic part of combat and it's a lot harder, or when things have died down a bit... and it's only going to buy you a few seconds of time, max.