[Brock's only real superpower is being able to tell (from anywhere in the world) if someone is in his car, so he doesn't instantly pick up on the fact that he's being followed. But he is a highly trained secret agent who's been in the game for 20+ years, so he's no slouch, either.
If it were anyone else following him, they'd just think he was obliviously going about his business, trotting along the rooftops. But Cass may notice his shoulders go briefly stiff after she's been following him for about a block, followed by him forcibly relaxing his posture to be as before.
Once it's been another block and a half, Brock abruptly ducks and rolls to the side, coming up on one knee and facing back toward her, crossbow at the ready.]
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If it were anyone else following him, they'd just think he was obliviously going about his business, trotting along the rooftops. But Cass may notice his shoulders go briefly stiff after she's been following him for about a block, followed by him forcibly relaxing his posture to be as before.
Once it's been another block and a half, Brock abruptly ducks and rolls to the side, coming up on one knee and facing back toward her, crossbow at the ready.]