Nico was completely freaking out. He had just seen Percy's head slip under the surface of the mud and the hellhound that was preventing him from going to help was still battling strong. He jabbed again, cutting off a knot of the monsters fur and catching a chunk of its skin. It whimpered in surprise and turned to lick the wound.
"Fight me, you demon!" Nico screamed at it, frantic. He wanted to take the creature down, but would never do it when the thing was undefended. It raised its huge, shaggy black head and glared at Nico bearing its teeth in a vicious snarl. Nico barely had time to raise his sword before the hellhound was on top of him, ripping at his shirt and slashing at his limbs. Nico tumbled back and was back on his feet so fast it would have made a stunt director proud. He jabbed at the monster's paw and cut an arc down, impaling the hellhound's paw into the ground with his sword. The creature howled in pain as it shook its paw loose. Nico stepped back, contemplating his next move. He then took three bounding steps forward before launching himself up onto the monster's head. The thing was taken by surprise and shook its head furiously almost knocking Nico off. He clung on, using fistfuls of shaggy black hair. Nico got his legs locked around the hellhound's neck as it continued to try shake Nico off. Nico raised his sword above his head; he let loose a battle cry before using both hands to drive the sword down into the monster's skull. Instantly the creature started disintegrating beneath him and Nico jumped off admiring his pile of dust.
"Aaarrrggghhh." Came a cry from behind him and Nico spun around to see Percy struggling in the mud. Nico ran over and took a hold of one of Percy's legs and began pulling. Nico instantly knew pulling wouldn't help. Nico let go of Percy and took a step back. Percy's entire torso was now under the surface, but from the struggling Nico knew Percy wasn't suffocating. He took a deep breath before shoving his foot down next to Percy's head. Instantly a thing wrapped around Nico's ankle and began tugging. Panic formed in his chest but Nico forced himself to be still and get pulled in until the mud covered his hips, then his chest, and then his head.