This discussion may contain spoilers!
Hopefully this hasn't been covered already, and I haven't read the comics, but don't be afraid to spoil some things for me if you have to. I'm okay with it.
First, some basic questions about the magic and the severed heads.
Do these (presumably) magical cuts merely sever the bodies but not the spirit? Do Snow and Faith see and feel their heads in a separate place from their bodies, and is the 'lips are sealed' binding an added insurance to prevent revealing the location in case someone figured out how to get their heads to talk? Also, outside of the gritty details, does a Fable's ability to survive have anything to do with how renown their own story is or not?
Maybe one clue to reconnecting these women comes from Grendel's effort to reattach his arm (if you chose to tear it off as Bigby)?
Anyway, I was thinking about the blade that was used by Lawrence, bloodied and laying on the floor in his apartment. When I considered the stain on the bed, it seems as if he cut his wrist while sitting on the corner, with one leg pointing toward the window, and the other toward the TV, hence the pooling over the bed corner and onto the floor. However, in some playthroughs, Lawrence prepares an ambush with you, revealing that he is right handed when holding the gun (if I recall correctly).
Oddly, why would he use his left hand to cut himself? Wouldn't he do a more precise and accurate job with his dominant hand?
This got me thinking about the mirror. If you can view people, and you can control what it can or can't say, is it a stretch to use it to watch and control someone with it? Enough to get someone drunk and inhibited enough to go through with something that he felt like doing?
That is, if you were controlling someone facing you by viewing them in a mirror, their left hand would line up with your right hand, assuming you needed to move with them to perform such a lethal action. Also, the note on the bed was stuck there with blood, which may mean that If someone controlled Lawrence, the note was written before the 'self-harm' took place, though that doesn't explain why the words on the note aren't mirrored, unless he was first turned around according to the viewpoint of the person in control which would then properly let both write as it's seen.
So, maybe if there's an exemplar of Lawrence's handwriting it might be possible to give weight to this idea and reveal that his note to Faith was in the handwriting of someone else.
That's my input. Let's see what you guys think.