SARGEANTROCK-
The way I read the 2015 Ford F-53 motorhome chassis manual (link
here), you have a problem and a symptom.
The symptom is: When the engine quits, the Hydromax electric brake system kicks in, so you have stopping power. That explains the "lightning bolt" and brake lights. There should have been a buzzing/pumping noise coming from around your feet at the same time- but you may have been too busy to notice.
The problem is: Your coach lost power.
The cause is: I don't know.
I suggest you take the coach to a mechanic or Ford dealer who can diagnose the power loss. They might start by reading any error codes stored in the OBDII (On-Board Diagnostic II) system.