As they continued to climb the tree, Fili was helping his brother climb, but the youngest almost lost his grip as the tree began to shake. The wargs were trying to knock the tree down! That wasn't going to help them at this rate, and getting down wasn't an option! A warg managed to at least climb a little up the tree, but didn't get far. 

Hovering near the said-tree, the she-elf screeched at the Pale Orc's taunt before she shouted Black Speech to the creatures. After this action, the winged elf aggressively collided and toppled one of the climbing wargs, right off the cliff below. Knowing that it wasn't over yet, the female made a u-turn, before charging back and hit one of them head-on. 

Thinking quick, Gandalf retrieved a pinecone, and conjured blazing fire upon it. "Fili!", he passed one down to the eldest prince below, as well as the others, and throwing the blazing object at the creatures, creating a trailing wall of fire to get them away from the tree.