[Grieving]

No. Whatever the state of mind of both parties, Grosskreutz and Huber were responsible for engaging Rittenhouse in combat (in the second encounter). Even if the initial encounter were the fault of Rittenhouse (I don't believe that it was), he was running toward police in a non-threatening manner. You aren't allowed to attack a fleeing person, much less one clearly attempting to turn himself in, which is what Huber and Grosskreutz did. When you do so, you are responsible for the encounter and can't claim self-defense. The only scenario in which they could is if they then attempted to flee and Rittenhouse continued the attack, which didn't happen (and in which case all parties would be guilty).