As Chuck said, this is very clearly a backcourt violation.
Again, as he said, it's not where the ball was touched but who touched it last before it went frontcourt to backcourt and who touched it first after it went frontcourt to backcourt.
Summarizing from Hawk's and Bob's posts:
1. Team A control
2. Ball in Team A's F/C
3. Team A last to touch before ball goes to B/C
4. Team A first to touch after ball goes B/C
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