How do you solve the Buck's Row Deduction Board?

For the X360 version...
Examine the "couples" nearby and the lone streetlight.
Examine crime scene: barn/stable door, bonnet near hand and ground near body.
Examine body: blood pool, throat slit, 2 bruises, tongue and stomach area.

During the re-enactment, have Watson stand up and attack with knife from all 3 directions.
Have Watson lie down and use knife in left and right hands. Change killer's position to all 3 directions, with knife in left and right hand.
Using bare hands, strangle Watson lying down, then standing up. Try all 3 directions when strangling standing victim.
When you have all the clues and possible scenarios, you can complete P. Nichol's Deduction board.

Bonnet + poorly-lit + "exercise' = holding bonnet in hand = she wasn't afraid = had bonnet in hand, ready to "exercise"
No blood on wall = slit lying down = throat slit
Little pool of blood = blood didn't flow in strong spurts
Dirty and damp ground = couldn't have relations on ground
Didn't have throat slit while standing + blood didn't flow in strong spurts + couldn't have relations on ground = P. Nichols was dead before being stretched out and having throat slit
Tongue is bloated = P. Nichols was strangled
Corpse still warm + no footsteps + cut open throat = victim wasn't dragged = P. Nichols' murder took
Place on the premises
Bruise on right jawbone = hard pressure by fingers + standing in front to strangle = left hand stopped her from screaming = right hand for strangling + throat slit from left to right + sitting on victim, knife in left/right hand = is killer left or right-handed? = killer is strong man

If any of your presumptions on the right of the screen aren't green, change up the options in the middle until they are.