I had this feeling too.
On the one hand, I compared the English sound "s" with my own "s".
On the other hand, I think 's' is pronounced very short and fast when it is at the end of a word.
PS: I also thought that 't' sounds like 'tʃ' when 't' is at the end of a word. By the way, how do you tap 'ʃ' down? What a surprise! I just copied yours and pasted it. :-)