Once before I had to slam my brakes and I felt ABS activate with a vibration. But this time they did lock up before I hit him, but they only screeched.... :/
Thats my exact thoughts on it also, their logic is that it's hard to tell who is at fault - The last car in the line could have caused all the damage, due to pushing all the cars forward into the car in front.
As for the ALB not working... you said you weren't travelling that fast.... could it be a case of ALB doesn't operate until car is travelling @ say 15mph??