They startled because you were in a hurry. They are perceptive of body language while most humans aren't even remotely aware of it. It's very normal chicken behavior to startle, as a prey species.
For a prey animal to attack, they either need to be amped on testosterone, or backed into an...
:th
No.
Aggressive chickens are not scared of your clothes.
Aggressive chickens are not suffering hurt feelings that you forgot to do a square dance when you entered their visual field.
Aggressive chickens are not jealous that you get to talk to your friends on your cellphone and they don't...
Having empathy is a good, worthy thing.
But when one party is being violent, you have to choose which side to have empathy for.
The victim or the perpetrator?
You cannot rehome these chickens or their bloodline. A hen attacking this viciously is an extreme, unusual thing. There are no excuses...