Suspenseful nothings (4)

The fourth part of Suspenseful nothings! (See here1 and here2 and here3)
"But what am I to call you? What is your name?"
"Firgrass," the boy replied. "Now then, forward march!" (this to the vegetables.)
The band of vegetables hurried off in such a way, that it reminded Sarah greatly of seaweed, moving back and forth on the waves of the ocean. It was not too long before she was finding it very hard to keep up with them, as they were moving very fast.
"Firgrass! Tell them all to slow down a moment! I'm getting so dreadfully tired!" Sarah called to him. Her call was unheard, however, whether it was because of the violent swishing sound of the hastily moving vegetables, or that Firgrass was too far ahead to hear her. Thus she felt very hopeless and miserable. She thought to sit down a moment and refresh herself in that way, but, no, that would do no good, for the vegetables would soon leave her far behind, and would Firgrass even notice that she was missing? She thought it not likely, as he didn't even want to be here in the story. She then hastened to catch up with the group, giving out the very last of her strength, and pushing on past the tall corn stocks that were rubbing her face in the most annoying fashion.
"I say, can you talk?" Sarah asked a large tomato plant, as the thought occurred to her quite suddenly. The plant made no answer. Then Sarah remembered how Firgrass had spoken to them. he had used a bunch of rhymes. Maybe she could order them to slow down, if she thought of a clever enough poem to persuade them.
"Plants, plants, corn and potatoes,
Celery, green beans and tomatoes,
Tired and saddened my feet have become,
Slow down, before they are completely numb."
To her great astonishment, the garden of veggies did slow down! But it was not for long, as another voice soon called out,
"Haste, haste!
Go, Go, Go!
At a fast pace,
Don't stop, or slow!"
"Ugh!" Sarah exclaimed, and it was all she could do to keep up with the moving field. "I'm grateful to him for sure, but not if he insists on having my feet walked off!"
They soon came to a thin glade of trees, then a brook, and finally, into a ring of old noble-looking oaks. On a large stone at the base of one of these trees, Lucy had fallen on her face, her hair lay a tangled mess upon her shoulders.
"Lucy! Oh, Lucy!" Sarah exclaimed, and hurried over to her at once. She called her name repeatedly, and talked to her, and lifted her from the stone, but no answer did she receive. Lucy's eyes had a glazed sort of look to them, and her face was as pale as death.
"She isn't dead is she?" Sarah asked Firgrass, with horror.
"Nope." He had paused in front of the stone, looking at them with no expression on his face whatsoever. "You didn't think we brought all these veggies along for nothing did you?"
Sarah looked around. "Where are the vegetables?" Firgrass started suddenly.
"You mean they're not here? Oh, dear! where did they go?"
Sarah saw a dust cloud in the distance that was gradually getting smaller and smaller. "Is that them?" she asked.
"My goodness! Yes!" exclaimed Firgrass with horror. "I forgot to halt them!" He rushed off with a tremendous speed in the direction of the dust cloud, and Sarah could have laughed at him, if hadn't been for the state in which her sister lay.
"Oh, Lucy! Please talk to me! Tell me what is wrong!" Sarah whispered over the pale face. She knew it would do no good, but had Lucy just stirred?