So something/wire at the battery or near the belts that launched is broke.
This is just in case.
Other thing could be a coincidental timing chain jumped teeth on the over rev recovery decel. With a socket at the crank can you turn it back in forth and feel a decent free play feeling before the chain catches kinda deal?
When I drove it home it still ran good I just had to let the clutch out in gear to start it it was getting hot so I would get up on speed turn it off then let the clutch out again until I got home