He had put the Sadducees to silence (ephimōsen tous Saddoukaious). Muzzled the Sadducees. The Pharisees could not restrain their glee though they were joining with the Sadducees in trying to entrap Jesus.
Gathered themselves together (sunēchthēsan epi to auto). First aorist passive, were gathered together. Epi to auto explains more fully suṅ. See also Act 2:47. “Mustered their forces” (Moffatt).