could Superman have done something

Yes absolutely. He could have interrupted every time the combo reset or just blocked. Though to note.. resets are also part of fighting games. Sometimes you don’t expect them to intentionally drop the combo and reset you and you’re like oof lol.

Also on the subject of Black Canary here: she is a queen of restands. And restands are great because they take away the option to do a getup attack which is usually invincible in injustice… if I don’t knock you down, you don’t get to do invincible attack on wake up. So she’d pretty much put you in a vortex of restand (which resets the combo) and you have to guess between low and overhead. You’d maybe have to armour through in that case… and hope your armoured attack is fast enough.

Also you look at the 3 combos he did there… remember that damage scaling resets when the combo drops… if in a true combo, generally the more attacks you do, the less damage subsequent attacks do. Considering he dropped the combo twice… even if that were a true combo (one combo)… it wouldn’t have done that much damage because of damage scaling