“But seriously, how does a warning sense distinguish between good and bad approaches?”

↓ Transcript
Panel 1: (The Crimson Fly is walloping Jim the Criminal into the ground)
The Crimson Fly: This is getting really easy.

Panel 2: (Jim retaliates by splashing sand into the Crimson Fly's goggles)
Jim the Criminal: Here's sand in your eye!

Panel 03: (The Crimson Fly tries to calm down, by reminding their self about their "fly vibe" warning sense)
The Crimson Fly: The Crimson Fly: Wait, my Fly vibes! Wait...

Panel 04: (The Fly reaches out, trying to sense the danger)

Panel 05: (The Fly swings wildly, connecting their fist with Jim's jaw)

Panel 06: (The Fly reaches out again, trying to sense danger)

Panel 07: (The Fly blindly backhands Joy in the face)

Panel 08: (The Fly kneels over the stunned Joy, trying to apologize for accidentally belting her in the face)
The Crimson Fly: Agh! I'm so sorry, Lady! Sorry! Sorry!