Do you really need a shoot with that much forward momentum? How fast do you think they are going, you think they cross some ski's while flying then use them to land in the lake?
On May 28, 2011, Japanese wingsuit pilot Shin Ito set world records for the longest wingsuit flight of 23.1 km (14.4 mi) jumped from 9,800 metres (32,000 ft)[20] and the fastest speed reached in a wingsuit of 363 km/h (226 mph).
A wingsuit flier manipulates the shape of his body to create the desired amount of lift and drag although most wingsuits have a 2.5 to 1 ratio. This means that for every foot dropped, two and a half feet are gained moving forward.