How does zayn does it??

I m curious to know that how Zayn sings the chorus of Dusk till dawn song. I mean when he starts like "You'll never be alone, I'll be with u from dusk till dawn" does he switches from chest voice to mixed voice at " ...never.. " and then switches back to Chest again and at "...with you..."in mixed? And if you are a tenor how would you do it??