At the very least, Thor still adhered to the basic laws of the human body, and just used a standard one-handed attack with his short hammer, which just had additional recall and lightning attack functions.
Luke's stretchy arm, on the other hand, twisted and turned like an electric cable, and alternated between short- and long-ranged attacks with the hammer.
The attack range was so wide that even Thanos's three-meter-long blade couldn't keep up.
A normal long-range attack with a chain weapon just relied on inertia to smash into a person, so it wasn't hard to predict where the attack would land.
Luke, on the other hand, could do whatever he wanted with this 'manual muscle chain weapon.' He could twist his arm however he wanted and the hammer would hit whatever he wanted it to hit.
If it wasn't for the fact that Thanos had a huge physical advantage, he would've long been brought to bear by this cheat-like attack.
