If a mage decides to cast a 'Rouse The Beast' quick spell in the Final Quickcast Phase, is the target creature then able to take the granted action or has the entry into the Final Quickcast Phase marked the end of all possible actions for the round?

The Wizard has previously placed two hidden enchantments - Jinx on the Beastmaster and Nullify on himself. The Beastmaster then casts a Dissolve quick spell on the Wizard. What happens if the Wizard activates both enchantments or does he need to? I am assuming if the Wizard activates both enchantments in the counter spell step, the Nullify destroys the Dissolve before Jinx can return it to the Beastmaster's spell book. Is this correct or does one take precedence over the other? Can the Wizard save one of the spells?
(I guess the proper strategy would be for the Wizard to let the Jinx fizzle and to only activate the Nullify.)

The rules state that flying creatures cannot be blocked by walls but do they ignore wall attacks as well?