How did the guy in the 1st episode of Westworld not get hurt when he was shot? [duplicate]

Copied from this answer over on Science Fiction & Fantasy

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This was discussed with showrunner Jonathan Nolan in an interview with Rotten Tomatoes. In short it's the bullets that are special, not the guns.

With the same guns, the guests can blow the hosts away, but then the hosts still come back the next day.

“It’s not the guns,” Nolan said. “It’s the bullets. We thought a lot about this. In the original film, the guns won’t operate guest on guest, but we felt like the guests would want to have a more visceral experience here. So when they’re shot it has sort of the impact. They’re called simunitions. The U.S. military trains with rounds like the ones we’re talking about. But there’s a bit of an impact, a bit of a sting. So it’s not entirely consequence-free for the guests.”

_{^{11 RULES OF WESTWORLD — HBO’S KILLER ROBOT SERIES}}

The waiver on the HBO Official "Westworld" website offers the following info.

2. (c): All weapons and equipment used within Delos parks are the exclusive property of Delos. Inc. Gun ammunition contains proprietary safeguards related to bullet velocity, and tampering with gun safety features or ammunition automatically transfers liability to you and absolves Delos, Inc. of any injury or death that may occur as a result.

So there you go. Clear as mud.