There wasn't really anything left to say on that, was there? Unless there was some vigilante mission put into effect, either Dean turned up alive or dead and there wasn't much that could actually be done about it until then.
And he wasn't buying any of the nonchalance that Michael was trying to force into his tone either, and he was sure that if Michael had actually been looking at him, then the narrow-eyed look Anthony was giving him would properly tell him as much. "May have?" he echoed. "Don't try to downplay it as if it isn't a pretty big deal." Or as if the tone he used would be enough to somehow curb Anthony from worrying at least a little.