As I already said I wouldn’t run if I had to vote for Cruz. Some of the Cruz people did not intend to vote for Trump even on the first vote, although he won the state.
If they are bound delegates, they have to vote for whoever won the state (or proportionally if that is the way the state goes).
If they are unbound, then they are unbound. This is why Trump is failing, he is placing all his bets on winning on the first ballot.