X men blue(cyclops) pay power for plasma blast sentinels

[Alamos]

Hi guys, can a character under xmen blue affiliation, pay power for building more dice pool in the plasma blast attack from sentinels?

[Thoras]

They may not, no.

You pay the additional power for Plasma Blast during step 3 of the attack sequence.

X-Men blue is used before step 1 of the attack sequence.