At that moment the dogs began to bark loudly , and the bear rushed out of the thicket and set off in the direction of the mountain .<br>Without thinking that they had nothing to defend themselves with , should the bear turn and attack them , the boys gave chase .
A dog attacked them.
There is no clue to the dog was attacking them.  They escaped from the bear.
( z1 attack :ARG0 ( z2 dog ) :ARG1 ( z3 they ) )