Ohmwrecker's active should have some "spring a trap" effect when used near an allied turret

Ohmwrecker is an underrated item. It gives lots of speed when you're near turrets (seriously, 30% bonus is SWEET), it gives decent EHP, and gives you health regeneration. But there's one major problem with it: it has virtually no use if your team is on the backfoot. It's designed for tower-diving, not tower-defending.

Since Riot probably won't like any feature that lets you keep a turret alive for longer, why not add on a feature to the Ohmwrecker active that essentially "springs a trap" on enemies who tower-dive you?

I dunno exactly what effect would be best, though. Maybe it'd cause the turret to emit a snare/slow effect on enemies near it, or maybe increases the turret's firepower for a limited time (ala Dominion's Garrison). There's definitely room for a variety of choices on the effect; it just depends on what's most balanced.