Rules Analysis
WFDF 2017 Rules
13. Turnovers
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13.1.
1
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A turnover that transfers possession of the disc from one team to the other occurs when:

This rule was changed from the previous rulebook version
This rule was added from the previous rulebook version
This rule has updates in the next rulebook version
13.1.2.

a pass is caught by a defensive player (an "interception");

13.1.2.
Children
13.1.2.
Associates
WFDF 2021-24 Rules
13.1.2.

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.