Destroyed bones minimum.
It has been calculated that Spiderman is going to break Jane's backbones by catching her midair with a swing. Imagine something go at hundreds of kilometers per hour and you decide to latch into it *SPLAT*
Even if you somehow managed to climb into them (for example before they can take off), I and demi already concluded about 10-20 g force experienced without PIC involved. At that point, you simply has no power to latch anymore.
And you'll be thrown with that much acceleration and *SPLAT*
Now I know why Ichika is very careful at carrying the girls
