The centurion (ο κεντυριων). A Latin word (centurio) used also in verse Mark 15:44 and here only in the N.T.

Which stood by over against him (ο παρεστηκως εξ εναντιας αυτου). This description alone in Mark, picturing the centurion "watching Jesus" (Matthew 27:54).

So (ουτως). With the darkness and the earthquake. See on Matthew 27:54 for discussion of "the Son of God," more probably "a Son of God."