You dont understand the scene at all. He run away from Shanks cause his crew arriving would lead to Strawhats+Scabbards+Yamato+Red Hair Pirates vs Aramaki. He knew it was a overkill with 2 yonkos beeing now there+their Crews. Aramaki thought the strawhats are weakened from the Battle and wanted to catch atleast Luffy but the moment Shanks arrived its too much forces vs him alone. Shanks would run away as well if he faces 2 Top Tiers with their Crews alone without his own Crew cause he knows he aint standing a Chance lol
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he never had a chance to begin with