Forum:Shrink help

i was just wondering, how does shrink work, because the ruling says reduce the original ATK by half, and then add the eqiup boosts after. But in the game Stardust Accelerator, i had relinquished equiped with stardust dragon, and my opponent used shirnk and my attack went down to 0. Another time in the game i had Axe of Dispair on Beserk Gorilla, and my opponent used shrink and my atk became 1000 only.