"Slater? Here?" Harry replied, at first not quite believing, and then growing angry. This was his patch, not Slater's. They'd respected that, for the most part. Harry's eyes narrowed, and he began to guide Nell back towards the Theatre. "Go have something to eat and a rest, Nell. I'll be back soon. I'm gonna go have a word with Slater." He said, pulling off his jacket and draping it around the boy's shoulder.
And once he was sure Nell was inside, safe, he headed down the alley, in his shirt-sleeves, looking for Slater. The man wouldn't have disappeared yet, not if he thought he could work salt into Harry's wounds.