Kanan's pilot ability reads:
"When an enemy ship at Range 1-2 is attacking, you may spend a focus token. If you do, the attacker rolls 1 fewer attack die."
How does this interact with multiple attacks -- ie Corran Horn, TLT, Ghosts, and BTL-A4? "When an enemy ship is attacking" is clearly the trigger -- but does this occur only once per round, or once per attack? If I line up my stresshog for a shot (primaries and both TLT shots), will Kanan have to spend one focus (which then applies to all attacks), two focus (one for each "declare target" step), or three focus (one for each attack)? And would the same ruling apply for Corran Horn or a VCX with the title?
Thanks in advance.