I've seen this a time or two, but it seems to be more related to prey drive than anything else. Most recently it happened at a get together we had last year, mostly Labs, some Goldens, and my two, a Lab/Dane cross and a Mastiff/St. Bernard cross. The lady that owned the park where we had the picnic came to see how we were doing with her two Jack Russells, a couple of Labs bowled them over and her female started screaming. Several of the Labs and my Mastiff X ran over and were definitely not "concerned", if no one had been supervising I don't think the JRT would have survived. Some of the dogs ignored it, my dog and a few others got a strange kind of murderous excitement. My Dane X couldn't care less.
Another friend had an old terrier that had seizures, she saw her Dane kill it during a seizure- she couldn't get across the yard in time. The Dane seemed to get very agitated by the terriers unusual behavior- and it was definitely not an accident, her dog grabbed the terrier and shook it like a rabbit.
I've seen it at the dog park too, again, if no one had been supervising the little dog would have been killed. But it's not on a breed basis, it's an individual dog thing- I think aggravated by the pack dynamic of a large get-together. Almost like a mob mentality.
I think it may be related to the kind of excitement a pack gets when hunting, the urge to be in on the kill can be very strong in some dogs, and once the prey is wounded, the instinct to compete for the kill may override training/domestication. The screaming turns the little dog from buddy to "injured prey" in the dog's mind. Sort of the way some dogs are fine unless you run, and then the chase instinct takes over and they may pull or knock you down- running triggers an instinctive switch that overrides their normal behavior, some individuals have stronger instinctive drives than others, or in different areas.