I think its more useful to refer to science instead of the dhamma to explain things like this.
I think this was on TV somewhere: When lifting a car to get someone from underneath it, you just need to lift one wheel - one quarter of the weight or even less (depending on which wheel). Probably the wheel doesn't even have to leave the ground to create enough room. So also, the suspension helps. And it is just momentarily, not a constant lift. So it is physically possible and I guess the adrenaline rush does more than 'samadhi power'.