Is Volibear's ability to split 5 damage part of his 9 might or is it 5 additional damage?

Ruling: Volibear's ability deals 5 additional damage, separate from his might. This damage is dealt by an effect and has nothing to do with combat damage.

Nuances:

• Units damaged but not killed by Volibear's effect still contribute their full might during combat
• These units will take less damage before being killed by combat since they were already damaged by the effect