I previously reported that if you teleport while having a grappling hook anchored then your grappling hook stays and it tries to pull you back to that location.
Today I found that you also maintain falling momentum.
just wanted to let you guys know 
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Yes, I was nearly killed doing this today. It wasn’t really helpful that my home location was a pig-proof vault underground and I was 'porting from a mountain peak. Ow. Ow. Ow.