Maybe if there was a ship that could already get two shots off, one of them with an Ion Cannon...
But that would be crazy. Three shots a round?
(I love you Defenders)
But... the Snap Shot makes no difference in this case to the ability to use the ion cannon? If you get snap shot you also get to double tap, but snap shot doesn't inherently make the double tap any more or less likely - and in the case of most /Ds, the opportunity cost is bigger because you're losing the benefit of your EPT on two shots, not just one. Instead of Snap Shot you could have had a reroll on both shots with Predator...
You don't get to double tap after Snap Shot, because the card says you cannot attack again in the same phase.
Edited by costi