You were on a case to solve a murder and you were an undercover detective pretending to be a suspect, where as Theo was the detective solving the case. You both were working together as you were now under interrogation by him to make people believe that you were a suspect. No one outside could hear you're conversation with each other so you both took this opportunity to talk to each other

As you both were discussing he then noticed the cut on your arm "Are you okay?" He asked concerned