Please someone explain what's going on

[Vecejj]

This is the 4th time it's happened now over the past few months, whiles facing a summoner all my skills will just lock... they snare me and my Q/E says "cannot be used under these cirumstances" so I go to use Divine veil instead wondering what the *cricket* is happening and it says the exact same thing "cannot be used under these circumstances".

 

I can't q / e, I can't use divine veil, my SS + TAB was on cd so I was just stood there snared unable to move or use any skills... is this a scummoner skill or something?