[Kaimetsu]

Like, for the scout or something? Maybe a type of grenade or a capsule that you throw at the ground for a dramatic exit. Currently it's pretty difficult to escape from a dedicated pursuer, which is a problem for the less combat-focused classes. Smoke bombs would provide a quick, non-aggressive method for covering one's retreat. Plus they could have strategic value in other situations.

And no, 'lag' wouldn't necessarily be an issue.