Neville and Open
Neville spent a good portion of the fight riding Ruby. The dragon could scoop up ocean water and then throw it down on the burning buildings while Neville used spells to stun or damage or kill anything he could get a good shot at.
They were on their way back from the ocean, Ruby dropping water over another fire when Neville saw...something about to attack one of theirs, he couldn't tell who from his view above them, but he could see that they were too busy with some kind of wolf-like monster to notice the creature about to attack them. He tugged on Ruby and leaned to the side, laying down flat on him to steer them as quickly as possible toward the fight.
Once he was close enough to get a good shot he sat up and aimed his wand, shouting "STUPEFY!"
The creature dropped in a heap and he brought Ruby down next to it, he didn't know if a killing curse would work on these things so he set out in a different manner, first reducing it down in size and then hitting it with a cutting curse across it's neck to kill it with a wince. He never really did get used to that side of battle.