They were simply sitting by the shore, watching the waves as Lapis pushed and pulled them. Jamie figured that this would be a perfect low-key date idea, and it was. Lapis didn't eat, and she still didn't have a good grasp on Earth culture to be comfortable going anywhere. She had only been free of Malachite for a few months, after all. Those past few months were mostly dedicated to finding Jasper, but Jamie managed to get Lapis to relax enough to form a friendship, and eventually a relationship.
The day had been uneventful, until Lapis froze when she saw a mass of white hair surfacing. She squeezed Jamie's hand tight and leaned over to whisper to him, "Jamie, get out of here. Please." Jamie didn't have time to react before Jasper emerged from the water. Once she saw Lapis, she glared at her and charged through the water up to Lapis, who backed away as quickly as she could. Jamie, however, was frozen with fear. Jasper noticed this and grabbed him by the shirt.
"Let him go!" Lapis yelled, eyes widening in fear.
"Aw, Lazuli, you care for this creature? Is this Rose with another different form?" Jasper asked.
Lapis shook her head. "No! He's just a human, I swear!"
"You said that about the last one, too! Why should I believe you?" With that said, Jasper grabbed Jamie's throat.
"I said let him go!" Lapis yelled again, sending a water column to slam into Jasper. The bigger gem let go, and Jamie scrambled to his feet. He then ran behind Lapis.
"Jamie, please, leave!" Lapis urged as Jasper got back to her feet. To try to push him along, a smaller water column gently jabbed him back. She didn't have time to do more than that before Jasper summoned her helmet and charged at them. Lapis ran forward, dodging Jasper's first attempted headbutt and hitting her with another water column.
Jamie hid behind a rock, not wanting to leave Lapis completely. He wanted to help, but had no idea how to do so. Lapis looked like she had everything under control. Maybe he could go get Steven and his family. His train of thought was interrupted when he heard Lapis say, "You and I are going back to the bottom of the ocean, where NO ONE will be able to free you. We're going to stay there until the day this planet dies."
What she said unsettled Jamie. He didn't want Lapis to go away forever, to be trapped with someone she hated and who hated her in return. He stepped out from behind the rock and quickly approached the two fighting gems. "Lapis, wait!" he called out, "You don't have to do that!"
Lapis's attention shifted to Jamie just then, and her concentration wavered enough for Jasper to break free of the water bonds that Lapis had the larger gem in. Once she was free, Jasper laughed and grabbed Lapis, quickly slamming her into the ground. Jamie continue to approach them, now running to try to reach the ocean gem. Despite his efforts, he wasn't fast enough, and Jasper had a firm grip on Lapis's neck. Before Lapis could do anything, Jasper tightened her grip, crushing the smaller gem's neck and forcing her to retreat into her gem in a puff of smoke.
Jamie froze in his tracks as the blue gem fell to the ground. Jasper picked the gem up and sneered at Jamie. "Looks like the brat really was telling the truth. You would've jumped right in to save her if you were Rose." She noticed Jamie starting to back away and grabbed his shirt front. "Why did she want to protect you? She said herself that she never believed in this rock," she said more so to herself, looking him over.
Meanwhile, Jamie struggled to get out of Jasper's grasp. He didn't have to struggle for long before Jasper shrugged and dropped him, letting him land in the sand with a grunt. As Jasper started walking off, Jamie jumped at the larger gem, grabbing at the hand that held Lapis's gem. Unfortunately, his attempt was ineffective, and Jasper simply picked him up and threw him a short distance away. He only watched as Jasper walked away. Once she was gone, Jamie stood up and quickly headed to Steven's house. The mailman might not have been able to get Lapis back, but he knew Steven would.