I think maybe everyone in the boat was stunned and mesmerized into inaction, because otherwise, yeah, paddle like hell you morons! And I too though Wun Wun should give them a pull, but nope, every giant for himself!
Not sure on the army size issue. In the books, only a portion of the scattered wildlings army wound up at Hardhome, so it was not the full remnant of the army Mance had built. They were too disparate a group, so they scattered different directions to a large extent once Mance died.
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