I can swim. [He makes it sound as if he's added an "at least" on the end.] It's still humid, but it'll be cooler where we're going.

[Not wanting to grab Huaisang and throw the man more off-balance, he simply holds up an arm as Huaisang climbs into the boat; he can use it to catch Huaisang if something happens, but Huaisang is also welcome to use it as leverage. He doesn't move until Huaisang is settled.]

The movement will be better than sitting on the pier.

[Case in point, when Jiang Cheng pushes them gently off, the breeze of gliding along the water is fresh.]