Every rider's nightmare, that point beyond any chance of taking evasive action. So brave and thoughtful of his Mum to give this warning, it must have been very hard to do.

Give yourself a chance, reduce speed around junctions and traffic, cover the brakes, plan your options, expect the worse. Don't view throttling off/light braking as a negative in these situations, it gives you a chance to enjoy the acceleration a bike gives in getting you back to your 'cruising' speed. As with corners, slow in, quick out