Eren crooked his head, letting out a little laugh "Sure, our host didn't said that you have to choose. So you, want to find out what will happen if you simply do nothing?"

Maybe the 'grudge', the host is talking about is nothing but a joke. It's tempting to play with this fire. He didn't spoke out this thoughts, mostly because he assumed that maybe their host was among the people in the tent or was somehow spying on them.

He wrapped his left hand around the vial, feeling the glass pressing against his skin. He could probably break it, if he would use enough force. But then, this would probably be pointless since he had the strange feeling that these vials couldn't be destroyed. You could either look at them or open them to drink their content.

The next thought he was having, was a reminder that he had manners "Since it's not overly friendly to talk to someone without knowing their name ... I'm Eren." Life had made him cautious, therefore he decided that for now he wasn't revealing his surname. His name was already odd enough. He looked nothing like someone who had a Turkish name and yet he was bearing this name. Still he was unsure if fate was responsible for that or not.