Oathsworn have Impact I, which causes a panic token assignment when they collide during a charge.
Bull Pennon heraldry gives you Impact I
Either i missed it or RWM doesnt say anything about getting a repeat of a "tiered" ability, i.e. "I, II, III, or IV"
Does it do nothing since you already have Impact I, or does it goto Impact II?
The ability to immediately cause a Sev3 test on impact would be really brutal.... (assuming i rolled 1 to begin with to trigger it)