Thanos has Power Stone only. But he will get this feat.
Steppenwolf has 3 ax swings before the cold of the planet makes the ax shatter. However, he also has the active Mother Box unity with him.
There is a 5:55 timer lying somewhere. Once the time runs out, DD will adapt as he did in BvS.
The first fight is in character for Thanos, as the characters are stranded on one of the 9 Realms, and he knows that Steppy's Mother Boxes can activate boom tubes to port him out.
The second fight is morals off for Thanos, as he sees Gamora's corpse being kicked around by Steppenwolf.
Fight takes place in Jotunheim.