That is 3 damage not 4. Even if you COULD pull that off, you have to catch them. Easier said then dine really. And if it lives, it will kill your now double damaged ship.They're sooo vulnerable to a Glad with Assault Protons tho. Double arc for 2 face up cards, double bump with engine techs for 2 face down cards, job done. Doesn't need to get through the shields. Doesn't even need Demolisher.
These won't leave home (not mine anyways) without Advanced Projectors or at least Foresight.
2 face up cards (2 attacks) and 2 face down cards (double bump) equals 4, not 3. And the shrimp has no Demolisher ability itself,so it's gotta move in if it wants to use its blacks itself.