The game is played inbounds, but...

[ca_rumperee]

I'm trail.
Player A1 makes errant pass to A2 and ball is heading toward my sideline.
A2 jumps from inbounds, grabs ball and passes to A3 in the corner (towards endline).
A3 is legally inbounds, but has to reach over the line to catch the ball.
So the ball was literally passed from outside the line and caught outside the line.

My thoughts:
Legal play.
On an inbounds pass passing to a teammate who received it over the line would be a violation.
Its great to have the angle to see this play.