They came (ērchonto). Imperfect middle of repeated action, “they kept coming and saying” (elegon) in derision and mock reverence with Ave (chaire, Hail!) as if to Caesar. Note ho basileus (the king) in address.
They struck him with their hands (edidosan autōi rapismata). Imperfect of didōmi, repetition, “they kept on giving him slaps with their hands.” See note on Joh 18:22 for this use of rapisma.