Use corn while going against beat (the're exactly the same) when you start beat will be ahead then grind (You'll go as fast as a car) and whenever you see a rail grind on it . Then get to the part when you have to follow his exact moves grind through the glass keep a pressed when you jump the gaps then check the map, beat will be far away, but don't take you're tme though, or beat will boost-dash and hit you.