<human>: Unlike most posts in this subreddit this actually happened today.

First a bit of context my school has three [stairwells] that students use regularly. Also I will call the friends involved a,b,c,d and e. So the story starts off as me and my friends (a group of 5) are leaving period 4 as lunch had just started, we are about to walk down the stairs when b said he needed the bathroom so we walked back to the bathroom (which is like 5 meters away). We were waiting for about 30 seconds when c suggested that we run off before he gets out of the bathroom because he will be confused and annoyed etc (hilarious I know) so we all agree and run down the stair well, this is where the fu begins. At the bottom of the stair well there are 2 doors, one leading to the corridor that leads to the hall and 1 grey door on the opposite side of the room, this is a fire door. The door is always locked but to the left of it is a green button covered by a plastic shield that you have to lift up to access the button, anyway c lifts up the flap and presses the button, so the door unlocks and we open the door and at that moment a teacher walks into the stair well and sees us run out the door (at that exact moment b also appears) and starts screaming at us to get back in the stairwell, luckily for a the teacher didn't see him so he gets off Scott free. When we get back into the stairwell we get lectured by the teacher then taken to another teacher who also lectures us then taken to the vice principal who also lectures us, then the teacher that caught us gives us a detention. Apparently we were lucky that we didn't set off the fire alarm and cause a school evacuation.

Could you distill the essence of the text into 1-3 sentences?
<bot>: We tried to ditch a friend and ended up running out the fire door and almost setting off the alarm and ended up with 3 lectures and a detention.