Lawyer David Gibbs pleaded with the appeals court to order Schiavo's feeding tube reinserted to give her parents a chance to make a complete argument before a federal court that her rights are being violated.
Without a feeding tube Schiavo would die. 
Schiavo needed the feeding tube to live and that's why her parents needed it to be reinserted to have a chance to try the court case
( z1 die :ARG1 ( z2 person :name ( z3 name :op "Schiavo" ) ) :condition ( z4 tube :polarity - :ARG3-of ( z5 feed ) ) )