As he talked with him (sunomilōn autōi). Present active participle of sunomileō, rare compound and here alone in the N.T., with associative instrumental case. The uncompounded verb is common enough though in the N.T. only in Luk 24:14 which see and Act 20:11; Act 24:26.
Come together (sunelēluthotas). Second perfect active participle of sunerchomai. It was an expectant group of Gentiles eager for Peter’s interpretation of the vision of Cornelius.