Yes it's not a superhuman feat, but it's pretty impressive nonetheless. Airsoft guns aren't that accurate at 70 ft. They can be quite good, hitting other players in skirmish games, but not thickness of a sword blade accurate so the shooter couldn't just have been aiming at an agreed point that the swordsman has practiced to swing through. He would have been aiming at that rough area but not enough to rely on it. Velocity falls off a lot as the plastic BBs are very light, so the swordsman would have been able to see it coming to a degree but would still need fast reactions. At a constant 200mph the pellet would have covered the 70ft in 0.22 seconds but with the slowdown it may have been something like 0.3s. That's still less time than a batsman in cricket or baseball has to react and the blade and pellet are fractions of the size of bat and ball.