The patient dripped blood on/at every step while walking into the hospital.
I just stared at her while she yelled at me.
Nothing irritates me more than a chirping bird in the morning.
"The patient dripped blood on every step while walking into the hospital" would suggest to me that she went up or down a flight of steps on her way into the hospital, and dripped blood on all of them. "The patient dripped blood at every step while walking into the hospital" would suggest to me that she was steadily dripping blood as she walked in, such that for every step she took some blood was dripped.
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"The patient dripped blood on every step while walking into the hospital" would suggest to me that she went up or down a flight of steps on her way into the hospital, and dripped blood on all of them.
"The patient dripped blood at every step while walking into the hospital" would suggest to me that she was steadily dripping blood as she walked in, such that for every step s