Your Lovable Jackass GM
I mean, they're definitely superhuman. Could be sonic boom, as tanjiro went "the fuck was that, I heard a boom, but no ozone." After Zenitsu's shining moment.Ngl, been unclear at times with that. Like, I feel like Thunderclap and Flash is definitely enhanced with lightning , but Idk.
Then again, everyone apparently can hold their sword so hard they set fire, so...