Blindpepper Bomb (PF #157, pg. 78) is an Alchemical Bomb that requires a Strike to activate. When thrown it explodes in a 15-foot-raduis burst. All creatures in the area must make a Reflex save with being impacted on a success, failure, or critical failure.
Debilitating Bomb (PC2, pg. 66) is an Alchemist Feat that lets you add an effect to an alchemical bomb. "If the attack with the bomb hits, in addition to the bomb's normal effects, the target must succeed at a Fort. save..."
If a Blindpepper Bomb is made with a Debilitating Bomb Additive then which creature, or creatures, makes the Debilitating Bomb Fort. saves?
My interpretation would be that all the creatures have to make the Fortitude save from Debilitating Bomb. Blindpepper Bomb requires a Strike which has the Attack trait. What is a little less clear is what "hits" is. If a creature gets a success on the Reflex Save they still suffer some effects, which means they are hit and thus have to roll the Debilitating Bomb save. A critical success would mean they aren't "hit" at all.
I don't find any definition for the term 'Hit' in the rules it's all based on degrees of success. With the only mention of hit being in terms of calling a critical success a critical (PC, pg. 401)
I then looked for it a saving throw (PC, pg. 404) would be an attack, which leans toward it is based on a description of a Will saving throws: "Will saving throws measure how well you can resist attacks to your mind and spirit."
So this is obviously an edge case and I'm wondering what the actual rules say if I missed something in my interpretation.