Honda-Tech - Honda Forum Discussion - Changed head gasket, new prob + no spark?

Just finally got the head gasket replaced on my 97 acura integra.

Took it for a drive and things seemed fine. Car heated up to desired point etc.

Noticed 2 things I wanted to check more- 1) is idling when stopped felt fairly weak and possibly like if it kept up the engine would stall.

2) it was nighttime but seen some exhaust coming out. Wanted to check the color, thought it was maybe from sitting for 2.5 weeks without running. Did not have chance.

New prob) Since things seemed okay, took it for test run to the store. Things seemed great until I was in the turning lane to turn, seen a point to go, hit pedal and nothing.

Look down and see battery light on. Figured I stalled. Turn key - hear motors spinning but no spark!

Popped the hood and I look, seems the alternator belt fell off - must have just happened because light was not on prior to this turn. But I have no idea why that would cause no spark???

Timing belt and shafts spinning okay, just no spark at all.

Here is a recording so you can hear:

https://www.dropbox.com/s/04qfsn3zsc6320t/Video%20Sep%2011%2C%2010%2039%2029%20PM.mov?dl=0

Any advice on what this could be or what I should get checked/replaced?

Or any idea alternator belt falling off would cause this? Could it have whipped around and pulled something out?

Thanks