Eh, just what I heard.
Those thingies are very like vampires.
First and foremost, I liked the movie.
Spoiler: About how the bloody scene in the bedroom, with the kid and mum miraculously alive elsewhere, I'm not confused by it at all. They're living in a world full of blood thirsty monsters (debatable according to their varying degrees of intelligence), bluntly put. And they're still alive. It's kill or be killed, and I reckon they've killed some monsters to survive for 4 years.
Moreover, during the scene when Robert (Will) pointed the gun at them in the kitchen, the boy had instinctively armed himself with a knife before being told to put it down after the situation defused. I'm going to hazard a guess and say he's gotten into violent confrontations with the dark seekers too. Hence, the scene with the blood was most likely a slain dark seeker by the mother and/or son.
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I was really freaked out when Fred got over to that place.
He did say like vampires.
ah, thanks... that explains that mystery quite well.
This was a good movie but some parts of it was confusing. For example, why did the infected only send the dogs after Neville? They also never explained the mysterious liquid that Neville keeps using - I assume it throws the infected off his scent. How the hell does he still get electricity and clean drinking water? Stuff like that bothers me. =\
They only sent the dogs after him because it was still daylight outside. The "leader" infected had enough intelligence to send out the dogs instead, who could bear the pain, rather than going himself.
I don't remember any "mysterious liquid". I do remember there were two different things you might be thinking of:
1. He used a vial of his own blood to attract the infected when he captured one of them in his trap.
2. I thought he poured gasoline or some other flammable liquid on the steps leading up to his house as a trap if the infected tried to get in.