He opened the scoring after a cutback from Aaron Ramsey in the opening five minutes to get Arsenal off to a ideal start.
Pierre-Emerick Aubameyang's goals - the second of which he celebrated by dressing up as the Black Panther - either side of Ainsley Maitland-Niles' header were enough to obliterate the first-leg horror-show.
The smoke had barely died down from the red flares the Rennes fans let off in the away end before the home side had pulled the aggregate score back to 2-3 with practically the whole game to play.More news: Marvel Taps Destin Daniel Cretton to Direct Shang-Chi
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Maitland-Niles was being given plenty of room down the right-hand side and he made the most of that 10 minutes later when heading Aubameyang's cross past Tomas Koubek.
The Gabonese striker then proceeded to celebrate by putting on a Black Panther mask, which he was duly booked for by the referee.
Emery, who led Sevilla to the Europa League title three years in a row, may have been nervy in the second half before Aubameyang settled the tie.
- Aubameyang has been directly involved in 15 goals in his last 13 appearances at Emirates Stadium (11 goals, four assists). The late goal was the forward's second of the night, and it all but sealed Arsenal's place in the Europa League quarterfinals.