They can most likely watch.
I know that the Knight has a reputation for trying to get shy and submissive wives to do things beyond the pail of their typical sexual habits.
For example, he intentionally fucked Hotwife Annabel in a window/balcony so her hubby could look up from the pool and see his wife getting railed by a black guy. The knight is a kinky son of a gun like that...
If you ever listen to his dirty talk it's always some next level shit. I remember him telling Annabel he wanted to keep her shacked up in a hotel room for a weekend with a rotating crew of BBCs, BWCs, hell anybody with a dick walking in to fuck her. In the ass, in the mouth, dumping inside her, etc. He said he didn't want her to leave the hotel room all weekend. He really has a depraved/filthy mind.
Tl;Dr: he does indeed fuck the wives in front of open windows and untinted windows. He's kinky like that.