Emerald splash is a projection of life energy onto your opponent so it's possible it doesn't actually affect the physical realm. Even if it does it's silly to try to make full sense of what's basically magic.

I was a little more bothered by the fact they didn't just use a private jet, we have even already seen the company owned one when Speedwagon was the CEO so i don't see why Joseph couldn't arrange for one to come to Hong Kong as well.