Can two cards be discarded and the ranged attacks be combined?
Searing siege
A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
Can two cards be discarded and the ranged attacks be combined?
No. An ability may not Interrupt itself, so you may only use Searing Siege's action for either its Battle or a combined Interrupt.
If you had two Searing Sieges in the same unit, you could discard a card to each to combine.