To cry foul is to protest against something, but in this sentence they are staying quiet about the situation.
Context: "Their reactions weren't typical, and to the best of my knowledge, they didn't go back inside the building and keep quiet about the situation." Claim: "Their reactions werent typical, and to the best of my knowledge, they didn't go back inside the building and cry foul."
Considering the context, is the claim true, false, or unknown?