Rules Analysis
A turnover that transfers possession of the disc from one team to the other occurs when:
the disc contacts the ground while it is not in the possession of an offensive player (a “down”);
It is not a turnover if a player fumbles the disc prior to fully establishing possession when attempting to gain possession of the disc after a turnover, or after a pull that has already contacted the ground (see rule 8.1.4).
a defensive player establishes possession of a pass (an “interception”);
If a defender from Team A intercepts a pass while airborne and throws the disc before the contact the ground, and the pass is incomplete, that is a turnover by Team A and Team B would become the team is possession.A defender can intentionally hit a pass towards their endzone, but if they subsequently contact the disc before it hits the ground, this is a travel as per rule 18.2.5.5.