Anyone know exactly what Iwanagi-hime's buff does? I know it says counterattack, but every time I've used it it's done literally nothing. Is it simply a low activation chance or something?

Also, do tower medals reset does anyone know? Still sitting on ~10k as I'm not sure if I care enough about the brick given that the only thing I can really use it on is Gaia's weapon (have gotten 3 copies of the darn thing through jewel gacha). I mean I could just hold on to it as well of course, but I feel like considering my fire and lightning comps only have 1 SSR each the influx of jewels/tickets might be more useful xD.