The Driver doesn’t always know his capabilities

“Use the stunners,” said Danielle. “That’ll give these guys more time to make their shots.”
The armored skull tilted to the side. “The what?”
“The stunners. The Taser fields built into the fists,” she said. “They’ll put an ex down for a few seconds, long enough to give us an advantage.”
…
“The battlesuit froze for a moment. “Okay, stunners,” it said. “How do I do that?”
“I thought you were controlling the suit?”
“Yeah, but that doesn’t mean I know everything it does. It’s like getting a new car, y’know? I know how to do the basics, but none of the special features.”
“Great,” muttered Danielle. “Okay, let me talk you through it…”

Excerpt From Ex-Patriots, pg 546-547
Peter Clines
https://books.apple.com/us/book/ex-patriots/id585738393