Too many people are trying exactly this and causing one failure after another. I always see a number of ships parked and firing directly at the Entity, cannons and torpedoes blazing, only to have a half dozen Large Crystalline Fragments slam into them, exploding into three times as many Small Crystalline Fragments, and then successfully return to the Entity and restore nearly 20% of it's health.
Tier 2 is where you first get the Entity mission, actually. It's a level 17 mission.
Only reason Large fragments are exploding is because scramble sensors isn't up on the CE. If it was the fragments bump into you and push you around instead of exploding (unless someone drops mines on them).