And when he opened (kai otan hnoixen). Here modal an is used with ote (used about the opening of the preceding six seals), but otan is not here rendered more indefinite, as is sometimes true ( Mark 3:11 ; Revelation 4:9 ), but here and possibly (can be repetition) in Mark 11:19 it is a particular instance, not a general rule (Robertson, Grammar, p. 973). There followed a silence (egeneto sigh). Second aorist middle of ginomai. "There came silence." Dramatic effect by this profound stillness with no elder or angel speaking, no chorus of praise nor cry of adoration, no thunder from the throne (Swete), but a temporary cessation in the revelations. See Mark 10:4 . About the space of half an hour (w hmiwron). Late and rare word (hmi, half, wra, hour), here only in N.T. Accusative of extent of time.