I think Maguire was happy to let it go over him for 2 reasons.
1. He and the striker misjudged the flight of the ball and got under it, it would have been move dangerous trying to flick it backwards towards goal.
2. The height it bounced into the box you'd expect the goalkeeper to come out and claim it, but Maddison read the bounce well and DDG was rooted to his line as per.
We don't know if perhaps he got a call from behind also.
I thought he did very well considering Leicester was his home and he has a lot of good friends there, a very profesisonal performance.