Camarath
Pale Master Tarrasque
Sorry about that I missed definition 4a definition that does seem more apporate to this case (in fact all of the definitions under 4 seem better the definition I chose). I am sorry about and very embarrassed because of my blunder.Dr. Awkward said:The definition we're using is definition #4 (a), "occurring, acting, or accomplished without loss or interval of time." In other words, right now. (listed synonym: Instant)
Next time you try to make an argument by quoting verbatim from the dictionary, please try to read the entire listing and choose the definition that makes sense. This is just ridiculous.

I still do not see why in an abstract combat system an immediate extra attack can not happen if interrupted by another immediate extra attack but can be interrupted by an immediate AoO.