As the title says, barbariccia's 7 star stacking move Raging wind(RW), aero and aerora (also livid shantitty's aero I) have the exact same frame delay of 100. Therefore, it is possible for anyone with dc tornado and aero or aerora to pair up with barb.

When I'm testing this against the dummy, with barb triple casting nado-RW-RW, and the other unit casting nado-aerora, (tapping barb first) the chain will break into 2 parts, a 24 hit chain and a 1 hit chain. Don't worry guys, this is cuz nado's chain is so long that the 2nd RW arrives before the last hit of nado, so the last hit from barb's nado will break the chain but the 2nd RW still benefits from the full chaining 4x modifier. tbh it's a really small dmg loss compared to the RWs.

However, if you tap the other unit first, the 2nd RW will be the hit breaking the chain and dmg will drop significantly, so don't do that.

on multiple enemy battles, aero is better cuz it hits only 1 target like RW, but for 1 enemy fights, both are fine. currently aero is extremely easily accessible, since you can just craft it, a story equipment and the sylphids(20sp) also gives this. aerora also can be crafted or obtained via lexa's gale rod from nichol's SE, the sylphids also have this but it's after aero. the only unit that currently has both nado and aero/aerora innately is the 5 star capped shantitty.

I'm really thankful for this, whether the devs intend to do this or not, it's a big boon for barb to have units she can work with.