To try and prove he has the bottle to stick to onfield after clearly not doing so first time.
Plus Brighton scoring from the corner after ball hit Colwills head and denying Chelsea the 3 points, had to be prevented.
Giving ball back to Sanchez with a drop ball for absolutely no reason? and...
It's proven. They can't.
The speed the ball travels at and the speed to see and react from keeper, the taker will always score if its in corner and they wait. Basically keepr has 3 choices, left right or middle. Waiting to see isn't possible