The speed of a hummingbirds wings?
The speed of the newest race car?
The speed a hawk races to it's newly discovered prey?
No, no, no...its the speed vomit travels as it leaves Holden body. Which, if it takes her off guard, can propel her backwards with considerable force and cause her to lose her footing. Which can lead her to stumble into my legs one foot behind her (and the toilet) and cause her to look up in all the commotion. Which in turn can lead to vomit on the floor, walls, Holden's entire body, my feet, and my skirt. Which can then lead to the fifth "puke decontamination shower" of the week.