Function light_step 

fn light_step(
    here: &str,
    seal: &Seal,
    region: Option<&'static Region>,
    vault: Option<&(PathBuf, [u8; 32])>,
) -> bool

The quick part of the phone’s step, at every exchange: Android’s words copied, the requests decided and sent, a lost claim looked for, what the carriers let it send said (once an hour at most), what a multimedia message left behind swept. Under one lock for the phone’s processes. Whether something was written.