They came (ηρχοντο). Imperfect middle of repeated action, "they kept coming and saying" (ελεγον) in derision and mock reverence with Αςε (χαιρε, Hail!) as if to Caesar. Note ο βασιλευς (the king) in address.

They struck him with their hands (εδιδοσαν αυτω ραπισματα). Imperfect of διδωμ, repetition, "they kept on giving him slaps with their hands." See on John 18:22 for this use of ραπισμα.