I think that if you hit a teammate you should not lose points untill he / she press (M) to report your teamwounding, was playing on eu4, a friendly rider rode into my battle (1v1) big surprise there, I hit his horse since he came from the side and I didn't see him, lost 6 point beacuse careless friendly cav. Anyway, teamwounding points should be added if the guy who gets hits report you.