Teleporter. He can be in front of Batman, to the side of Batman, behind Batman, all in fractions of a second. At night his body becomes invisible in shadow. He has above peak acrobatic agility.
He can teleport fifty feet up draw the sword and teleport back down in the exact location where the sword will reappear in Batman's head.
Nearing Batman, Nightcrawler forgets he can even teleport, because Batman wields the might Bat-Force against him.
Then kicks him into oblivion, since he's apperently got a fast enough leg to trip Flash, and a powerful enough leg to knock the wind out of hulk or kick Captain Marvel so hard he transforms back into Billy Batson.