For proper destruction skoll must adhere to the following rules!
You must control the strength and shield skoll. We cannot allow the shield fell below strength. At lower shield below strength by 20% skoll freezes You and produces Icy. If not to prevent the reduction of the shield below strength, skoll will not produce Icy
P.S. you can Beat any ammunition and as soon as the shield is compared with the strength to fly away for a short distance and wait when skoll will restore the shield and will charge at You!
This technique was revealed to me at the end of the advanced level, when I had already spent 200,000 Zelenka , but the light has already passed without problems