I'm working on trying to ornament my playing of Rose of Sharon Waltz and I found a video of someone doing things I thought I could do:

I'm trying to do the thing he does at the end of the first phrase where he 'walks down' from the end note.  I don't know what its called.  It sounds like two half steps then a whole step down, but I can't get it to sound right. 

What is the proper way of playing that?

If that's too vague i can make a video of me trying it tomorrow.

Thanks in advance!