While all this was transpiring, Rubber Heart & Lotsa Heart were in the middle of a secluded area of The Forest Of Feelings that Stone-Heart had not yet attacked.
"This looks like a good place." The rubber bear said as he looked around. "We can train your new ability here once we find out what it is."
"Alright, Rubber Heart." Lotsa Heart said. Rubber Heart reached into his shirt & pulled out a list.
"This is a list of Gum-gum fruit abilities." He said. "I'll do various things to you to see which of these abilities you have. Once we find out which ability it is, I'll teach you how to master it."
"Alright, let's get started." Lotsa Heart said. Rubber Heart looked down at the list & then up at Lotsa Heart. He pocketed the list & walked up to Lotsa Heart.
"What're you doing, Rubber Heart?" Lotsa Heart asked, a little worried.
"Simple, it's the first test." Luffy Jr. replied. He grabbed Lotsa Heart's arm. "I'm gonna see whether you ate the Gum-gum fruit, or the Chop-chop fruit. If you ate the Gum-gum fruit, your arm will stretch like mine & Luffy's. If you ate the Chop-chop fruit, your arm will come off but you'll still feel it, like Buggy's." Lotsa Heart was hoping Orthoclase threw the Gum-gum fruit down his throat. Rubber Heart grabbed his arm & pulled on it, hard.
"YYYYEEEEOOOOUUUUCCCCHHHH!!" Lotsa Heart shouted in pain. Rubber Heart let go, pulled out the list as well as a pencil, & scratched out the Gum-gum & Chop-chop fruits.
"Well, that means you can't stretch like rubber or disassemble yourself." Rubber Heart said. "Maybe you ate the Slip-slip fruit & got super slippery skin."