Erm, glitch?

I found this a little while ago and I'm not sure if it's a glitch or not. I stood in the G.E. and started high alching really fast. After about 5 seconds all the right click options on players disappeared. This also happened in the Edgeville bank, and it's repeatable.

 

I also sometimes get a similar glitch in pvp worlds, except all the options are there except the Attack option! Its really frustrating. Anyway nice find, I'll see if it happens to me next time I login.

 

I've certainly done this before, not sure if it was from high alching but anyways, good find.