Relaunch: I've always been able to relaunch the kite after initiating the IDS system, both on snow and on water. But on water I've never used it in an emergency, only testing, while able to stand in the water. Though I dont see any major issues doing it in deep water.
The slackened lines hasnt wrapped around a wingtip, though I have experienced sometimes that when the kite is turned around again facing the wind, one of the steering lines may be wrapped around a center line, but I cannot give a precise description as to why this happens. But it is still possible to fly the kite back to shore. I got a good description about how to avoid it on the forum, think it related to turning the kite the wrong way into the wind again, but don't remember the exact wording
The struts and LE is quite big on the Crossbow to support the shape properly. But some people have claimed that the LE aint supported good enough (wingtips folding inwards) in very high winds (unsure if they mean inside or outside the range of the kite. Havent experienced it myself