Sorry for the stupid question but i am a bit rusty with rules nowadays. ;)

Opponent (playing UR) has a tapped volcanic island on the battlefield.
i play a wasteland and then a mox diamond. In response to the mox, opponent wants to daze it and bounce his volcanic to pay the spell.

Bouncing the land is an alternate cost so paid when spell is casted. So do i have a window to answer and use my wasteland on the volcanic before it bounces away ?

Probably no but i want to be sure (cost are costs and part of casting the spell).

Thank you :)