Why Should I?

"Is this your way of thanking me, for all the protection I've done for you all this time, Thea?" Kurt asked with his voice cracked from almost crying.

Thea squeaked. Two seconds later, he spat in Kurt's face with his spit mixed with blood. 

The pain that had run through Thea's stomach a few minutes ago evaporated along with the damp air in the room. 

The wounds on Thea's body healed on their own. Thea's healing abilities made her body never let the pain languish for too long.

"The way you protect me makes me feel insecure and comfortable, you mad wolf!" Thea shouted angrily.

Marc slowly got up from behind Kurt's back while giving Thea a nod.

With all her might, Thea tried to slash Kurt's chest with the iron.

Instead of escaping after asking Thea to draw the iron into Kurt's chest, Marc is trapped there. Marc wasn't agile enough to escape with his body covered in wounds.