Only the bull can take action.
It swings its head wildly from side to side, attacking both Ahmet and Bert ... but as it swings its head towards Ahmet first, it slips on the blood (rolling a 1 on its attack die), knocking its nose on the ground. The other horn attack is thrown off balance and doesn't happen.
There is still the bulk of the beast, however, and incidental damage is still done to first Ahmet, who takes 2 damage from the bull's head as it butts against the fighter's leg ... then as the bull backs, to regain its balance, it's hoof scrapes Maximillian's foot, causing 1 damage. Neither is enough to stun anyone.
Everyone can take action. The Berts will flee to 0608, hopping over the minotaur's legs.