Question about Repulsor Impact Field

By HeyMiiao, in Warhammer 40,000: Conquest - Rules Questions

Hello

Here comes a question: Does Repulsor Impact Field effect on the last hit on a attached unit ?

Ex: I attach Repulsor Impact Field on a Earth Caste Technician(1/1) . Can he deal 2 damage to the attacker?

Repulsor Impact Field

Attach to an army unit.

Reaction: After attached unit is damaged by an attack, deal 2 damage to the attacker.

Thx for replay anyway