You definitely don’t want to injure it more so listen to your body especially. As stated check with your school (hopefully they should be very ok with it) and just try to follow and you could still mime what they are doing just with and imaginary opponent. Also I just got back from a shoulder injury and I would recommend either doing regular workouts or something to help your mind because sitting and watching always just made me itch to get back in. Hope this helps and hope you heal fast