2008 Other Mazda Models bent valve?

I was driving down the highway at about 70 mph when a car coming up the on ramp pulled in front of me. To avoid hitting him I hit the brakes and the clutch and shifted to neutral. I was going for the e-brake, but saw no need so I let off the clutch and was going to pull over to calm down a bit before continuing. My plan was to just coast in neutral and pull off to the side to collect myself from the near miss. As I let of the clutch though I heard a real high rev sound and realized it was in gear. I guess I bumped it there or something. I immediately shifted back to neutral and was going to put it in the proper gear to just keep going, but when I did and hit the gas there was no acceleration. It just slowly coasted down. I didn't hear any abnormal noises or see any smoke. I stopped and looked around for any fluids and left the car idling. I then decided to turn it off and look under the hood. Noticing nothing wrong I decided to try and start it to see if it would go to get it to a shop, but it wouldn't start. I had it towed t the dealership and they say it may be a bent valve, but don't know for sure because they are still deciding who will pay so haven't looked to hard into whats wrong. I did notice the check engine light flashed at me like it was blinking and the check oil light also came on. Could one short over-rev like that blow the engine or bend a valve?