Spooks (not the spy kind)

It's been nearly a week since I last rode, so today I took Anky into the school and we worked on relaxation and bending. Slowly, slowly she's starting to release and give. We finished with a short trot on both reins and we got  some stretch down for a few strides, inconsistent but coming better.

I took Remy in the school and after a short in-hand session I got on. I was on for all of 30 seconds. I don't know what he spooked at, but he suddenly shot forwards and spun round, unbalanced me, which, I think frightened him more and he set off!
Where was my neck strap? I'd forgotten to put it on!
All I could think was,  'he's heading for the fence', which he was, and, 'I don't want to pull on his mouth', which, I don't know if I did or not!
Of course, before I could blink we were at the fence and I was wondering if he was going to try and jump it! He didn't, he just turned sharply and by this time my self self preservation/kamikaze/call it what you will instincts set in and I was looking for a way to get off.
I know, I wish I could overcome them, and , with Anky,who I know very well, I do,  but with an unknown quantity, my instinct is to get my feet back on the ground as quickly as possible. I don't know quite how I got off him, it all happened too fast, but it involved the fence, several splinters and a grazed leg. Both the fence and I are a little worse for wear,  but Remy seems ok. He trotted around the school as I hit the ground, and then came to me when I called him.
I got straight back on and he was fine so we continued with moving him around the school with walk/halt transitions and lots of changes of direction, then a couple of reinbacks and shoulder-in on the circle on both reins to finish.
Jim was up at the school, so he walked with me and  I rode him back down the lane home.
So, our first spook.  I'm glad it's over with and I'm really pleased at the way he calmed down so quickly after it. I'm sure that I could have dealt with it better, and I hope  that I deal with the next one a little better!
Next time I ride I will remember to put on the neckstrap and we'll work a little, using it for walk and halt transitions.