So basically in detail, what happened was this:
Coco was let out in the morning and she ran like crazy apparently. The stable hand told me she would be very calm because of that. Well I was sort of happy she wasn't. I don't like "molo" horses who are energy-less. She was pretty energetic and I had to often slow her down at the canter. The end of the lesson came and I always walk her with my feet out of the stirrups, and with long reins.
It was getting cold and windy so my dad proposed to close the big arena windows. He had to turn this thing to make them go up but it made lots of noise. She was ok at first but then we were parallel to the window and I suddenly felt her tense up...
I immediately knew she was going to bolt.. I was looking down at her and I saw her hesitate, then do that weird sideway footing and then she RAAAAAAAAAAAAAAN to the other corner of the arena. My feet were out of the stirrups (I think that might have helped my balance a little actually), and I didn't have control of the reins (or not all because as I said before I gave her some rein).
Well as I felt her beginning to bolt, I quickly gathered the reins, but only got them fully after she started to gallop. I was lucky I naturally fell backward when she took off because that helped me to bring her to a stop. (I naturally lean a little forward for balance you see), I know, very bad, but I was actually working on keeping my body and shoulders more back with my trainer today.
So ya it was a little scary, and during that 3-4 second gallop I got a cramp in my leg lol so I was trying ever so hard not to fall off.
Thanks for any tips or bolting stories you might share! I was lucky this time, and she generally is a really sweet girl, so I want to make sure I am prepared if I ever fall on a more frisky, naughty little guy who won't stop like she did.