A.T. Robertson Commentary Acts 16:29

"And he called for lights and sprang in, and, trembling for fear, fell down before Paul and Silas," — Acts 16:29 (ASV)

Trembling for fear (εντρομος γενομενος). "Becoming terrified." The adjective εντρομος (in terror) occurs in N.T. only here and 7:32; Hebrews 12:21.

Fell down (προσεπεσεν). Second aorist active indicative of προσπιπτω, old verb. An act of worship as Cornelius before Peter (10:25), when προσεκυνησεν is used.