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You snarl like a viscious animal.~
$n snarls like a cornered, viscious animal.~
You snarl at $M angrily.  Control yourself!~
$n snarls angrily at $N.  $e seems incapable of controlling $mself.~
$n snarls viciously at you.  $s self-control seems to have gone bananas.~
Eh?  Who?  Not here, my friend.~
You snarl at yourself, obviously suffering from schizophrenia.~
$n snarls at $mself, and suddenly looks very frightened.~