Crossword Genius

After taking drug Shaman bit three rocks simultaneously (2,3,4,6)

Ross

I believe the answer is:

in the same breath

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'simultaneously' is the definition.
Both the definition and answer are adverbs. Perhaps there's a link between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for in the same breath that I've seen before include "Without breaking off" , "needing no further inspiration?" , "with a single blow?" , "Together" .)

I've seen this clue in The Hindu.
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