[GAMEPLAY] Tristanna e giving tower aggro after it exploded on a target in stasis

On tristanna, when she used e on gangplank under the tower and stacked a few stacks, he went into stasis, and after the e exploded, while gp was in stasis, tristanna got tower aggro even if she did no damage. Should this be a legitimate game interaction? Seen it only once, but still, there's and oddshot video, so you can decide for yourselves