I hear אצמכה, it's the audio ok?, i don't hear the separation of the words.
Its the known bug that cuts off the first few miliseconds when you replay the audio. Try: play the audio. then play it again. then reload the page and play again. voilà.
I don't believe this is a Duolingo bug, it's probably a web browser bug (although I can't be sure).
The pronunciation there it's hard to unserstand.. seems to ear אזמחה - Atsmecha
It's more like "smecha", the pronunciation usually sounds good in my opinion (as a native hebrew speaker), I think it does take getting used to the language though.