Engineers Imp Hammer and Feedback Cascade

How does this combination work ?
(will damage the shield cell bank and reduce shield cell restoration)
1. Only the first hit out of 3 is taken into account ?
2. Every hit is taken into account ?
3. For the effect to manifest itself, it is necessary to hit with all three cartridges ?
 
It works on the amount of feedback damage done,

Basically you need all three hits to hit to do more damage/cancel more banks then a single c2 rail.
I understood correctly that for the right effect it is better to use a normal rails gun (C2) than an imperial hammer?
 
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