Excellent. This is exactly what we needed to win this one; it's a kind mercy from Haspen that only one of them tried to paralyze us. If they'd hit three of the rescuers or more, we'd be in trouble, but the problem is now trivially solvable.
Edwin: Moves to (12,30), Trade for Rescue Staff from Seyena, Rescue Alexander to (11,30), Trade Rescue Staff back to Seyena, Escapes
Raquel: Moves to (12,30), Trade for Rescue Staff from Seyena, Rescue Christopher to (11,30), Trade Rescue Staff back to Seyena, Escapes
Ami: Moves to (10,30), Escapes (Can do this at any time)
Seyena: Moves to (12,30), Escapes
And we're rescuing Alexander first because we'd rather have Christopher rolling into Alexander than Alexander rolling into Christopher when they hit the wagon at the bottom of the hill. 
I think this is the current plan. Ami's already escaped, so ignore her part of it.