You play it safe and cast Protego, a force shield appears around you and absorbs whatever nasty brown lightning curse it was that Malfoy just released!
And then you repeat this 3-4 times, you see Malfoy's face getting angrier and more impatient with every turn so you decide to just repeat this on and on and on until Malfoy starts moving towards you, fists in the air.
'Okay, come on now guys, let's be civil. Hah, boys will be boys!' Lockhart moved to intercept Malfoy stepping in front of him, but Malfoy didn't slow down in time and accidentally pushed him off the stage.
All was well, however, as Lockhart seemed to be fine, but Malfoy lost a couple of House Points. You simply hop off the stage before they ask you to continue, you like to end things on a high note!
Another few couples battled it out, girl named Alice Pepper has shot a powerful water stream at her opponent who has cast a redirection spell at the very last moment, sending the water directly at Lockhart again. Duelling continued until one boy has accidentally set the tapestry on the podium on fire, at which point Snape has called it a day and you all left the Great Hall whilst chatting enthusiastically - this has actually been way more fun than you anticipated.
Since you still had an hour to kill, the three of you headed to the library to work on the essay for Professor Binns until your eyes felt a bit too dry to continue reading about the 'Goblin Wars 'any longer. And your stomach has let you know that it's about time to be fed!