Gonna try!

Kazuma thought fast, before stepping forward, already hoping to lie his way out of it. "A male wizard! I met him yesterday but he said he was moving north of here!" he shouted.

"...you mean to tell me that I have been harassed this whole damn week, and the mage ran away like a coward!?" the Dullahan raged, but before he could fully buy the lie... Megumin decided to be a complete idiot.

"H-hey!" she shouted, whacking Kazuma upside the head with her staff. "Don't go giving non-existent wizards credit for using the magic I spent so much time and effort mastering!" Everyone froze, and stared at Megumin, wondering if she had seriously just confessed in a moment of idiotic pride.

"What is wrong with you all!?" the Dullahan shouted. "Is it not a reasonable grievance that my home has been attacked unprovoked for a week!"

"Yes, very reasonable!" Kazuma nodded frantically, waving his hands placatingly. "But you see, there's been a misunderstanding! We weren't out to harass you, honest! This idiot here is just obsessed with Explosion Magic, and we thought your castle was abandoned! It seemed like a good place to practice is all! However, we can can promise that the Explosions will stop!"

"I will promise no such-" Megumin started to protest. WHAM!

"We can promise that the Explosions will stop!" Kazuma reiterated, his eye twitching, his fist steaming, and Megumin laying dazed on the ground with a steaming lump on her head.

The Dullahan considered for a moment. "Hmm, I can consider it. But I would like reparations for my pain and suffering. What will you offer?" he asked.

"Um, oh, I think I have a nice peace offering here!" Kazuma stated, reaching into his bag, before pausing. "... actually, are you capable of eating or drinking anything, given... I'm sorry, but is there a way to say it politely, I'm drawing a blank?" Kazuma asked nervously, sweating. "I don't want to be an insensitive ass about it..."

"I can eat for your information," he said. "I'm not a skeleton under my armor. Geez."

"It's more about... Well, your head isn't... Screw it, I'm not going to figure this out," Kazuma threw in the towel, and just pulled out a bottle of wine, and threw it towards the Dullahan. "Top shelf stuff, coming up!"

Because the Dullahan was holding its own head the bottle broke against its body and wine poured all over his body. "Seriously! You brats!"

"...sorry, that was an accident! Um... How about I just come over and put two bottles in your bag, if you promise not to kill me?" Kazuma offered, sweating heavily.