I injected into my quad and I must of hit a nerve because the syringe flipped out of my hand and went 90° to the side... My leg twitched and everything... I just pulled it out and went to another spot... Everything ended up ok just that spot was sore for a while but I was scared to pin quads for a while
I've had a similiar experience before. You just have to pull out and start over. It's all you can do.
Yeh, I would say anytime something isn't quite right or out of the ordinary with an injection, just stop and start over with the e tire injection. It's never worth the risk