UNC sophomore R.J. Prince switches from offensive line to defensive line Posted Apr 2, 2015 On Tuesday, UNC rising redshirt sophomore R.J. Prince tweeted out "New opportunity! It starts now... #94TrenchMob". Digging deeper it was revealed that Prince would give the defensive line position at shot. "Trench Mob" is nickname given to UNC's defensive line by new position coach Tray Scott. (Carolina Blue)