Acts 28:6

However, they were expecting that he would swell up or suddenly fall down dead. But after they had looked for a long time and saw no harm come to him, they changed their minds and said that he was a god.

1. The natives are not in "wait and see" mode. They know that very quickly the venom from this snake will cause swelling, and death. Any minute now they expect Paul to show the effects of the poison.

2. Enough time passed that Paul should have died, and didn't. Now, the natives change their minds. They do a 180.

3. To survive this snake bite, he must be a god.