Three people are in an alley with a dumpster, one skateboarding over the dumpster while the other two look on.
The person is in the air on the skateboard.
Just because one skateboarder is over the dumpster does not mean he is in the air.
exists p1 s1 x1 x2.(-(x2 = x2) & n_look(x2) & card_eq_2(x2) & a_on(s1) & Manner(p1,s1) & while(p1,x2) & exists x3 x4 x5.(in(x1,x3) & with(x3,x4) & rel(x4,x5) & over(x5,x4) & n_dumpster(x4) & n_dumpster(x4) & n_skateboarding(x5) & card_eq_1(x5) & n_alley(x3)) & n_people(x1) & card_eq_3(x1))
exists p1 x1 x2 x3.(n_skateboard(x3) & n_air(x2) & n_person(x1) & in(x1,x2) & on(x2,x3))