Ian brushed past Drax and ran straight to his restroom. He could tell the man was confused, but he did not care what he thought at the moment, he needed to go, and hearing Mina laughing behind him was not helping. When he was done, he showered, then went to find Mina so he could strangle her. She had introduced him to the chips, and while she had told him not to eat too many, she had neglected to tell him why.
Mina was not in his study, not in her room, and not in the sitting room, so Ian went to his private kitchen where he could hear Mina exaggerating his facial expressions, while Mills mocked Dom who she says was panicking the entire drive.
Ian made a mental note to tell Dom that if Mina killed him, she was definitely fair game, but he hoped it would never get to that point and with everything that he had already done to her, he would tell the man to make sure that Mina's involvement in his death was solid, and confirmed, not speculation.