idea for a twist
I was thinking, it would have been a cool twist, if at the end, like when Alex is unlocking all the front door keys to escape, he sees a sillhouette of a man pointing a gun, (thinking the blind man has cornered him again)
And theres a brief shouting exchange (the gunmen telling Alex to drop the crowbar or something) and he shoots and kills Alex .pop pop pop.
As the armed figure steps into the light, its his father, the security guard.