How was Tom's reaction at the graveyard different from Huck's?

Huck was afraid.... Tom prayed.

Presently Huckleberry whispered with a shudder:

"It's the devils sure enough. Three of 'em! Lordy, Tom, we're goners! Can you pray?"

"I'll try, but don't you be afeard. They ain't going to hurt us. 'Now I lay me down to sleep, I--'"