Two things. Once the A/C is moving NO Pilot is going to come out of the cockpit to "check a door". If it is a safety issue its the FAs JOB is to respond to the Pilots concern. Secondly, if that slide deployed with the door mostly closed, the F/O would not have lived through it to be sent for drug testing. The door does NOT have Pneumatic Assist, so the door will not fly into fully opened position. The slide would have opened inside the cabin and once it starts, there's no stopping.
So please really!
The other day working the 1L on the 737, the gate agent was assisting in opening the door. The girt bar slid off and got hooked up into the doorframe. I started to scream STOP, then another "arm" starting pulling to get the door opened. That "other" arm belonged to the kid that does the HHDs (who has NO business touching ANY A/C door). Thankfully, I was able to get them to stop because if that slide blew, I would not be here telling this story and calling BS on this post.