That was pretty much an invitation to eat him. Echo easily dodges the punch, then clamps down on his arm and yanks back. The metal armor is smooth and tough to get a grip on; she grabs the edge of the gaunlet and kicks a leg at his abdomen, catching on the pelvic plating.

It's a challenge but she's suitably agitated at this point to keep working at it. So far he hasn't done anything offensive, so in those regards he's relatively harmless. She pushes her weight froward to knock him down and pin him, biting down repeatedly on the arm until she catches the black undersuiting. It's still rather tough but eventually a small tear gives way and she thinks she's making progress but then two things hit her at once.

There's a weird foamy blood the creature oozes that tastes absolutely foul, accompanied by a pervasive smell coming from the tear that a sharp intake of breath gets a full nose of. It's overwhelming and sharp and in an instant she's letting go and scrabbling back, rubbing at her muzzle and making distressed noises. This thing is definitely not for eating.