Respuesta :
by he departed leaping and laughing his lair to return to with surfeit of slaughter sallying homeward.
Answer and Explanation: In these the readers can see what type of monster Grendel is.
"Their slumbers thirty of thanemen"
"he departed leaping and laughing"
Being these the most clear excerpts we can learn that Grendel not only has killed 30 people, but also he has laughed about these murders.