Ruby explains.

After class was dismissed, Ruby approached Jaune, as he stood alone in the hallway, putting a sexy saunter in her step. "Master, relax," she told him, pressing her barely clothed body into him. "It's really not your fault."

"I mean, I don't know... I WAS feeling slightly anxious about watching Weiss fight that Grim," Jaune replied, gently embracing her in his arms, just enjoying the simple contact.

"I don't think you were feeling that more than the rest of us," she shook her head. "There's a whole different reason that Boarbatusk charged you..."

"What, you about to tell me that the lamp attracts Grimm or something?" Jaune asked with a snort.

"...um... Actually yes," Ruby chuckled sheepishly, poking her fingertips together.

"...you've gotta be kidding me..." Jaune grumbled. "You mean to say I'm now a beacon for any Grimm within a mile radius while carrying the lamp?"

"Eh, not quite that bad, Master," Ruby assured him. "It's considerably closer than a mile... About a third of that at most before the Grimm can sense it..."

"That's not that much better," he grumbled.

"Also, the lure isn't as strong as **** negative emotions, or a group of people having minor or moderate ones," she added. "It's not all that bad... You just need to be mindful of it..."

He gulped slightly, and nodded. "...so," he continued, running his hands along her sides. "I can tell Weiss has her problems with us..."

"That's for sure," Ruby sighed. "Maybe Ozpin made the wrong call?"

"And what call might that be, Ms. Rose?" Ozpin asked, having turned the corner in time to hear that last comment, his ever present mug of coffee in hand.

"Oh, um, Professor!" Jaune jolted, greeting Ozpin along with Ruby.