Arras

This movie is pretty good, the characters development in purgatory state are unexpected, but here is some plots (spoiler): 1) If touching the rock ties you to the field, why did Travis help Tobin, and Ross did not? 2) Tobin touched the rock but somehow he managed to get out from the field, and didn't stuck in the loop. 3) Ross seems to have overpowered abilities (blowing his wife's head by his bare hand, very fast..) but somehow he struggled against Traviss who was already fallen from roof top, and severely stubbed in the abdominal. 4) What is the purpose of the stone ritual? ...