The islanders were expecting him to swell up or suddenly drop dead. But after waiting a long time and seeing nothing unusual happen to him, they changed their minds and said he was a god.
Textus Receptus (TR) - Acts 28:6 >Οἱ δὲ προσεδόκων αὐτὸν μέλλειν πίμπρασθαι ἢ καταπίπτειν ἄφνω νεκρόν· ἐπὶ πολὺ δὲ αὐτῶν προσδοκώντων, καὶ θεωρούντων μηδὲν ἄτοπον εἰς αὐτὸν γινόμενον, μεταβαλλόμενοι ἔλεγον θεὸν αὐτὸν εἶναι.