D-Prison Problems!

Scroll down to "THE ISSUE" if you just want to see what happened, or read the duel before that, because hey, why not?

BEFORE THE ISSUE:

zaziuma: Hello
dueler1335: hi
zaziuma: No Extra Deck huh
zaziuma has lost 1000 life points
dueler1335: nope
zaziuma: wait what?
dueler1335: nvm
dueler1335: misclick
dueler1335 placed a counter on "Nightmare's Steelcage" in ST-3 (now 1)
dueler1335 placed a counter on "Nightmare's Steelcage" in ST-3 (now 2)
dueler1335 has lost 2000 life points
zaziuma: chain
zaziuma: wait
zaziuma: just a sec
dueler1335: k
zaziuma: well
zaziuma: I dunno if countdown's cost is an effect or a cost
zaziuma: go on
zaziuma: I won't use my card now
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 1)
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 2)
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 3)
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 4)
dueler1335 placed a counter on "Nightmare's Steelcage" in ST-2 (now 1)
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 5)
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 6)
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 7)
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 8)
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 9)
dueler1335 has lost 1600 life points
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 10)
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 11)
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 12)
dueler1335 placed a counter on "Final Countdown" in ST-3 (now 13)

THE ISSUE:
zaziuma has lost 2000 life points (negating Scapegoat with Warning)
zaziuma: wait hold on
zaziuma: no you can't actually use prison
zaziuma: you activated it when I declared an attack
dueler1335: yea i can
zaziuma: there's only one declaring an attack
zaziuma: here
zaziuma: Let me show you
zaziuma: http://yugioh.wikia.com/wiki/Breakdown_of_the_Battle_Phase
zaziuma: If the Turn Player passes, and the opponent passes as well, the chance to activate cards like "Sakuretsu Armor", "Mirror Force", "Magic Cylinder", etc. is GONE.
zaziuma: So yeah
zaziuma: So, we good?
zaziuma: Or do I need to call an admin? (half a minute goes)
zaziuma has called an admin
dueler1335: you didnt pass you used warning
zaziuma: it's the same idea
zaziuma: Let me find a Ruling from a card page
zaziuma: I'm sure I can easily find something
dueler1335: ill wait for admin
zaziuma: so
zaziuma: What up?
zaziuma: Why you suddenly return those? (returns Kuriboh to hand, and places D-Prison in S&T Card Zone)
dueler1335: made it how it was when you attacked with tiras so the admin could see
zaziuma: Just so you know, I am 99 % sure about this
dueler1335: admin will be the judge of that
zaziuma: I just can't find a card Ruling that states that
zaziuma: atm
zaziuma: If I knew some more cards that activated in response to declaring an attack it would be helpful
zaziuma: Then I could find something.
zaziuma: But I can only recall Magical Cylinder, Mirror Force, D-Prison
zaziuma: We can also say you activate that card  before the Battle Phase
zaziuma: Then you can use D-Prison
zaziuma: If you want
zaziuma: I'm fine with that
dueler1335: ok
zaziuma: if that's the case, I want to do this first (places Claw in S&T Card Zone)
zaziuma: so d-prison is negated
dueler1335: you could only equi[p that to a utopia
zaziuma: It is equipped to utopia
zaziuma: the trap negate applies to the whole field
zaziuma: Take daage please
zaziuma has canceled the admin call
zaziuma: damage*
dueler1335: either way you cant during your battle phase...
zaziuma: You just agreed that you played Scapegoat during the Main Phase
zaziuma: and not the Battle Phase
zaziuma: Make up your mind dude
dueler1335: tf i activated when you entered battle phase..
zaziuma: I have priority to declare an attack at that point
zaziuma: Which results in the same thing as before
zaziuma: since I am allowed to attack
zaziuma: you activate Scapegoat
zaziuma: I negate it
zaziuma: you can't activate d-prison
dueler1335: omg youre such a noob
dueler1335: what a waste of my time
zaziuma: No, you're just wrong
dueler1335 has left the duel
zaziuma: Really now. When I try to make a compromise.
zaziuma: They just quit. Funny that he should say that, considering that he's playing a Final Countdown Deck