it says it walking to the position you started it on.
I went from 71-86 doing enfeeble+alch and stun/alch and didn't encounter anything weird
Was this when it was trying to take a break?
No I wwon't be adding high alch to this, it increases the bann rates way too much.
I did multiple tests and it's not worth, you are better off training purely magic after doing agility
Enjoy the trial