1. His superhuman strength is sufficient to easily lift well over 100 tons using minimal strength, his strength is great enough that he has defeated Darkseid in combat and effortlessly held his own against the likes of Superman and Captain Marvel.
2. Orion is functionally immortal and is undying and cannot be killed through conventional means.
3. Orion's superhuman speed is big factor, he has been shown battling opponents as fast Superman and was displayed being able to land several blows to him without showing any sign of difficulty, Superman moves several times the speed of light as does Orion.
4. The level of superhuman stamina he possesses leaves him virtually inexhaustible however he has been shown to tire during battles with beings of near equal power such as Darkseid.
5. His invulnerability is enough to sustain blows from the likes of Darkseid, Superman and Captain Marvel. Aang has nothing in his arsenal that could possibly cause any physical damage to Orion.
6. Orion also possesses a regenerative healing factor and can heal from severe injuries during battle.
7. Orion is a master combatant, strategist, weapon master, tactician and master pilot.
There is too much physical power for Aang to handle in this battle.