If he truly wanted to save him, he should have untied the ropes now instead of making him run around with them still on.
But he did not disappoint Malfoy. He suddenly slammed a fist into Malfoy's face. Malfoy fell to the ground.
His face was still full of disbelief.
"Catch him! Be careful, he's very strong!"
Someone shouted loudly.
Darren turned and ran.
He sprinted toward the exit.
But when he got outside, he found that Harry and the others were in terrible shape. There were several more Death Eaters outside.
These Death Eaters had clearly been worried that Harry and the others would escape, so they had been chasing after them and attacking them.
Darren rushed over and knocked two of them unconscious, only for the Death Eaters behind him to charge out together.
He dodged a streak of red light, then punched Bellatrix in the face.
The Death Eaters avoided his attacks. They tried to ambush him from behind.
One Death Eater shouted, "Don't be afraid! The poison on those ropes will take effect soon. Darren Potter won't last much longer!"
They started playing cat and mouse with Darren, focusing all their attention on causing trouble for Harry and the others.
Darren stopped chasing them down and began rescuing Harry instead.
"They're here..."
Someone shouted, then fell silent.
They had probably been knocked unconscious.
Several Death Eaters rushed into that room, and Darren charged in after them.
He grabbed one Death Eater by the sleeve.
Then came another punch.
The Death Eater went down.
Darren looked toward Harry.
A purple light shot from a Death Eater's wand, aimed directly at Hermione. He hurried over, and the purple light struck him.
Darren pretended to stagger back in pain, but said nothing.
He turned around and subdued that Death