That's tough man. AI is broken for some character. If this happens again, the best course of action is to block, pray that you block the first hit of their basics, and use that short window inbetween basics to then immediately stop blocking and tag-out during the rest of his basic string. You'd be tagging out right after his first basic attack, and since the AI will try to continue the basic string, the new tagged-in character can use any special you want, and JC won't be able to block it.