I have a feeling it might be reentering the state machine from the root after the montage is finished playing, hence why the sword equip part is played. If you are able to get the state machine up on another monitor or dock it into a part of the editor and see what happens, if it keeps on coming in from the root after the montage is played then you would need to change your setup. There were a few animation changes in the last engine build as far as I remember so your old method may no longer work in 4.13, but what you are trying to achieve should work in one form or another!