You have to have Luna and Sola. Go up the stairs, up the boxes and hide to get past the bull. He should suddenly turn and chase you. Run away and jump down the drain as you did the first time. You may have to try more than once. Let me know if it doesn’t work.
After a bit of trial and error I got it. But after the scene the bull glitched, he doesn't interact with me, his limbs are wrongly overlayed and he glitches behind some walls. Also, I can't put the missing itens on the cupboard in the apotecary. I akready got the speed boost and interacted with him many times.