I don't see this posted here but back in January 2013, Trevor posted a scene from Guardian Angel on his Facebook page. The post is public, so you don't need to be a member of Facebook to view it.
The scene seems to be the introduction between Mick Angel and his version of Beth (named Riley)...
In case you want to take a break from Coronavirus-induced Netflix binge watching Trevor just set up a Patreon and is posting chapters from Guardian Angel. The prologue and first three chapters are free to read. Later chapters (up to chapter 7 so far) can be unlocked for $9.99/month. (Looks like he’ll be posting four chapters at a time. )