whatever method he chose to abduct Sarah whether by coercion or force there would be extremely high risks in this location in London. That makes this case so strange. Why would a serving officer take such extreme risks of being sighted or caught out, unless he really didn’t care about being found out
There’s potential that it was never meant to escalate the way that it did so he hadn’t factored in the extra risk into his initial intentions.
On the other hand, someone who is willing to take the life of another must have an ego and a heightened sense of self worth. Perhaps pure arrogance was his downfall.