May looked to David when he grabbed her hand, and she yanked it out of his grip quickly. After he spoke, flashbacks of the time when she was almost kidnapped because she was alone came to her mind, and she glared a bit at David. She didn't know him! And he was already suspicious to her as is, especially considering that he was ready to chop off her professor's head. He had to be some demented and mentally sick patient. 
She said to him crossing her arms, "I'm sure you can tell me what you have to say right here," Erika and Joan stood by her side, also wary of the man that wanted to speak to her alone. Erika cracked her knuckles as a silent warning, while Joan pulled out her phone, just in case.