near the end of rensen's animation, you are able to cancel it into super. it's always been mostly useless tech, but otgs make it particularly useful against slayer as means of countering super mappa. this effectively means that super mappa is deceptively easy to hard punish as long as you bait it properly. after bomber hkd and throw, this is a pretty easy setup to do.
if slayer ever tries to k mappa, you just hold down for spinning chain strike, which will let you otg him again for another mix or more space