Ah, I see, so it's more of a surprise combo. Still... it sounds like my Dthrow>Utilt>Dair>Dthrow thing. It can work, and when it does it's awesome, but odds are it won't. Then again, I said more or less the same thing for Vermiis' combo, and I was wrong, so what do I know?
Kirby can easily recover from Falco's side B spike though provided he's not at insanely high percents or has used all his jumps. On top of that, it puts Falco in freefall, so he has to be predictable when using it and either be able to land on the stage or the edge. This makes him meet Kirby's Bair at supersonic speeds with his face.
As for his Dair, it only sweetspots at the bottom at the very beginning, so I would assume your friend is just good at sweetspotting it (to be fair, most good Falcos are. I am not a good Falco...(Yes, it's always about me!))
Thing is, you can recover from both spikes, and odds are he won't land them anyway, unless he CGed>spiked you, since you have a lot more aerial mobility than he does.
No worries, I was just messing with you.
Also, we should probably get some Falco mains in here.