Mark 6:51

Mark omitted the record of Peter walking on the water (Matthew 14:28-31). This seems unusual if Peter influenced Mark’s writing. Perhaps Peter "was reluctant to picture himself in such a unique and spectacular incident." [Note: Hiebert, p. 167.]

Another miracle happened (cf. Mark 4:35-41). The wind died down as soon as Jesus stepped into the boat. This astonished (Gr. existanto, cf. Mark 2:12; Mark 5:42) the disciples further.