What was Poole's description of Hyde when he saw him, briefly, in the garden?

From the text:

He looked up when I came in, gave a kind of cry, and whipped up-stairs into the cabinet. It was but for one minute that I saw him, but the hair stood upon my head like quills. Sir, if that was my master, why had he a mask upon his face? If it was my master, why did he cry out like a rat, and run from me? I have served him long enough. And then...’ The man paused and passed his hand over his face.