The state of being extremely nervous as proven by the body language, sweating, squeezing things, etc. but still being able (or forced) to talk almost in normal tone, way below the CAPSLOCK
Actor 1: "I have messed up the shooting scene big time."
Actor 2: "How come that I did not hear Frank cursing all over the place?"
Actor 1: "He had to behave zengry
, his mom was there."