Rule Book Clarification

[Mr. Ref]

I've looked all morning thru the search feature and can't find it on here or in the rulebook.

Situation:

Team A has front court status. A1 passes to A2 who is close to crossing the division line. Player A2 leaps and then gets one foot down, catches ball and then back foot comes down in the front court.

Legal play.

We had discussion at halftime and a fellow comrade thought they had to have two feet down to have front court status.

My question is.... Where in the book does it outline this? I know 4-35 handles player location, but it does not specifically talk about one foot vs. two feet.