Why was Jack able to act in a wild manner after assuming the "mask"?

Read this excerpt from tim o’brien‘s “ambush” “i had already pulled the pin on a grenade. i had come to a crouch” which literary device is most clearly shown in this excerpt?

2. which of the following topics would be too broad for a speech lasting 5 to 10 minutes?

Which evidence from the text best supports the idea that malcolm and donalbain believe they need to flee scotland before someone tries to murder them too?