No counterplay..? Just don't run in to a reaper or dancer while they have LB ready if youre not planning to chain CC them. If you dont have any CC on your team then you should be playing defensively utilizing line of sight in the first place.

As far as getting 1 shot on the checkpoint, I think the counterplay is just everyone playing defensively while the samurai toys are active. Playing aggressive (which most impatient players like to do) will juat get you the ultimate punishment.

The only time you should realistically play aggro while those samurai toys are out is if you have a DRK or PLD who pops LB on the checkpoint in overtime for that last push past 50% to win your team the game.