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Identify the mood in the following passage.
The wolves close behind, unable to stop, and as unable to turn on smooth ice, slipped and fell, still going on far ahead. Their tongues were lolling out, their white tusks were gleaming from their bloody mouths, their dark shaggy breasts were flecked with foam; and as they passed me their eyes glared, and they howled with fury.
What is frantic, exciting, frightening, etc.?