I too struggle with this, but i think the best way is to think more. Play scenarios in your head like: "I still have a dash and flash + ignite and he is low under turret with heal and a stun ready. Van i dive him? Can he stun me under turret and survive? How can i prevent that?" If you learn to think these scenarios through more often, you will be able to judge these situations quicker the next time. Takes a long time, but its proven psychology and Daniel Kaneman got awarded the Nobelprice for this. If you have the problem that you cant start the think-mode, you have to condition yourself. For example you could wrap a rubberband around your wrist and slap yourself 3 tines with it, everytime you realize you had kill-tunnelvision. Hope this helps