Goat concussion?

Hello all.

So today I'm out working on the pasture fencing.. I have all my does and babies in the same pen and about 2 weeks ago had purchased 2 new baby bucks and placed them in the same pen. Both bucks are healthy and have had no problems eating , they're bottle fed. So after I leave the pen maybe an hour or 2 later I head back out... and I see one little buckling is happy as ever but my other is down. He was lying in the back of the shelter. His head was cranked back. His legs twitch form time to time and hes calling out. His breathing is not labored , his heart rate is fine. He is drooling a little but is swallowing. He wont suck though. They're both a month and a week old. I dont think hes sick..

Sorry for the long explanation,

At first we thought his neck was broken the way it was cranked back. But all his bones seem to be in place. Nothing feels wrong. He wont tilt it forward tho. Every once and while hell kick his legs out like hes running. This just happened so there will be a vet call but am curious if anyone has heard anything like this. I am so worried. He also had what seemed like a quick seizure and then back to normal breathing and heart rate but not capable of moving. Also once I saw what looked like he was trying to shake his head ( in the cute way they do when they've finished their bottles). But it wasn't seizure like . I think one of the does may have butted him real hard.. but they all seemed fine together. If anyone has any info please let me know.