Ron never joined in, choosing to stay by the radio inside the tent with his injured arm as an excuse, but Harry did. They worked two against one, teaming up with Harry who was also bonded gave Hermione the challenge she needed. It seemed as though spending so much time around the Slytherin’s had also strengthened her cunning. Trees were ripped out the ground and flung towards them, leaves transfigured into blast ended skrewts, and little black rocks she explained were "Peruvian instant darkness powder" - courtesy of Fred Weasley - were tossed at the boys as they duelled. 