These people are doing dangerous things.
People are engaging in risky behaviors.
Risky behaviors are dangerous things.
exists e1 s1 x1 x2.(n_people(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_thing(x2) & a_dangerous(s1) & Theme(s1,x2))
exists e1 s1 x1 x2.(in(e1,x2) & n_behavior(x2) & a_risky(s1) & Theme(s1,x2) & Actor(e1,x1) & v_engage(e1) & n_people(x1))