Misty felt like her heart had completely stopped. How was Erick going to cover that up? How were they going to keep Shane from finding out about what they were. She backed away from Shane a little bit, pretending it was because she was done with his bandage, but in all honesty if he found out the truth about them she didn't want to be in arms length of him. He seemed nice enough, but what if he captured her, or even killed her. 

"You aren't the first person to wash up." Erick replied his jaw twitching a little. Then he motioned towards Shane's arm. "Plus, as you found out we aren't strangers to the mutations." 

It was then that Misty realized just how stupid she had been. They could come up with excuses all day, but there was no proof of how they got on or off the island. No proof of anyone living on the island. No way to explain any of that.