Who is the speaker, who or what are they talking about, and what do their words tell you about them?

Quote in context:

'Here he is!' bawled Giles, calling in a state of great excitement, up the staircase; 'here's one of the thieves, ma'am! Here's a thief, miss! Wounded, miss! I shot him, miss; and Brittles held the light.'

Giles is speaking. He is speaking to Rose about Oliver, who has been caught robbing their home.