To add to this... a lot of 'boss' fight enemies in Pathfinder will have some 'mega attack' that requires 3 actions. Half the time simply walking away as your third action locks the boss out of using that ability.
"I step back" is a meta move in Pathfinder.
A counter to it that equally extreme as the opposing move is "I grapple them." Which is a great way to put an enemy right where you need them for another person's 3-action kill move.
I've also seen the new 'reposition' move uses to extreme:
On my first action I reposition that guy to this other side of the door here. On my second action I close the door, trapping that one guy in the room with all of us. On my third action I step back so the caster can drop an AoE on the spot, or I grapple him, or I attack, or whatever...
Reposition is only one roll: athletics with their save as your DC.
- Suddenly your "basic martial" can be all about terrain control and putting people exactly where you want them to be.
Best use of this I saw was when our barbarian's third action after that reposition was to 'shove' the NPC further into the room, right where the other PCs were standing - so they all got all 3 actions without needing to move in first.
Too bad he did that against the weakest enemy in the fight. But he's done similar since against tougher targets.