what do benjamin and the others realize as Boxer is being taken away

One afternoon, a van comes to take Boxer away. It has “lettering on its side and a sly-looking man in a low-crowned bowler hat sitting on the driver’s seat.” The hopeful animals wish Boxer goodbye, but Benjamin breaks their revelry by reading the lettering on the side of the van: “Alfred Simmons, Horse Slaughterer and Glue Boiler, Willingdon. Dealer in Hides and Bone-Meal. Kennels Supplied” (123). The animals panic and try to get Boxer to escape. He tries to get out of the van, but he has grown too weak to break the door. The animals try to appeal to the horses drawing the van, but they do not understand the situation.