Jace fired his Dragon's Breath as another missile was let loose off the transport. It traveled for a second before it blew up and the chopper swerved in the air in response. Or whatever the equivalent of swerving in the air is called.
He could just feel it sway as the force of the blast from the missile hit them. The transport behind them had to swerve away as that was the second missile that Jace had fired out of the air. The transport was likely having to figure out another strategy especially since they were on their last missile.
Jace had been leaning halfway out of the chopper so he could see past the tail and fire at the transport. So he was able to lean back into the chopper as the transport flew away. He was not firing at the transport since the heat from the Dragon's Breath was not enough to melt the hull.
