Well, you were high on adrenaline just before the break I'd bet, after all it was terrible exciting right?
So you go for a break, long enough for the adrenaline rush to disappear, you start to feel a bit sore and tired (forgotten in the adrenaline rush), it has been a long day after all. Not to mention that it was a long call, so your muscles started to cool down a bit.
Not to mention that you're mentally spent from concentrating through a adrenaline rush, so you have a hard time concentrating on top of your body beginning to express the notion that right about now it would be nice with a bunch of carbohydrates for quick energy, a hot tub of water and a good book.
Doesn't really seem all that surprising that you couldn't hit the jumps as well as before when viewed in this way, does it?
I've certainly experienced many times in that past that after a lunch break, it'll be a bit of time before I'm riding entirely as well as I did just before the break.