How much damage does Black Bolt's enemy attack deal, and can one attack's damage be split among heroes?

Question

Accepted Answer

Each attack inflicts Wounds equal to the highest Danger Level (1 to 4). Each hit goes to a single target, and its damage is not split among heroes unless a skill or card says so.

Marvel Zombies: A Zombicide Game

How much damage does Black Bolt's enemy attack deal, and can one attack's damage be split among heroes?