Four colliding ships

Problem statement

Four ships are sailing on a 2D planet. Each ships [sic] traverses a straight line at constant speed. No two ships are traveling parallel to each other. Their journeys started at some time in the distant past. Sometimes, a pair of ships collides. A ship continues its journey even after a collision. However, it is strong enough only to survive two collisions; it dies when it collides a third time. The situation is grim. Five of six possible collisions have already taken place (no collision involved more than 2 ships) and two ships are out of commission. What fate awaits the remaining two?

Solution to metapuzzle: show

Restated puzzle: show

Solution to puzzle: show

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Source: Sanjeep Dash. Puzzle statement as at

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