Thats exactly how demetri acted today.. it took me like 10 minutes just to catch him. I probably should have just left him in the tank but I needed to do a really big change and I figured it would be less stressful to get cupped.
I trick mine to get into the cups... I hold them half in the water and put a blood worm towards the back of the cup and wait... within a min, a min half they swim in and then I tilt the cup up and trap them. lol Every time! At least they get a treat... ( water change day is fast day.)