They are doing the carpentry work and their ears are closed by the headphone.
Carpenters listen to music as they work.
If the Carpenters are listening to music, they wouldn't be able to hear if someone gets hurts.
exists e1 e2 x1 x2 x3 x4 x5.(n_headphone(x5) & n_ear(x4) & of(x4,x2) & n_thing(x2) & n_work(x2) & of(x2,x3) & n_carpentry(x3) & n_thing(x1) & Actor(e2,x5) & Theme(e2,x4) & v_close(e2) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1))
exists e1 p1 x1 x2.(exists e2.(Actor(e2,x1) & v_work(e2)) & n_thing(x1) & as(e1,p1) & to(e1,x2) & n_music(x2) & Actor(e1,x1) & v_listen(e1) & n_carpenter(x1))