The other crows will not know where their friend is and they will conduct an investigation. Once they find you, they may try and murder you. Thats why it's called a murder of crows
Just cooperate and don't escalate the situation. If you remain calm they'd probably just let you walk and finish your sandwich elsewhere. Even if your right, is it really worth the drama over something this small?
This is why I left customer service. Because . FUCK. DEALING. WITH. PEOPLE. you have no idea how crazy people are. A lot of untreated psych problems out there.