Ryoko walked into Washu's lab because Tenchi was in there probably. Ryoko knew that HER Tenchi and her mother was getting to close to one another. If she ever find out the truth, Ryoko would beat Tenchi within an inch of his life...but Washu would turn her into a water sprite for a month. So, Ryoko figured that Tenchi was in the lab, and Kiyone had gone to look for him.
Ryoko saw that Kiyone was in the lab, but a strange light shot out of what looked like a gun that Kiyone was holding. The gun was pointed at Kiyone, and all that Ryoko saw was a pile of clothes. Puzzled, Ryoko went to the pile of clothes and was startled to see a tiny Kiyone walk out of the pile!
"Kiyone?" asked Ryoko.
"AHHHH!" screamed Kiyone.
Ryoko picked up the gun from the floor, but she didn't pull the trigger.
"So this is Washu's new invention" said Ryoko. A shrink gun. Well, as soon as she found Tenchi, she would shrink Tenchi down and have some fun with him. Ryoko looked around her mother's lab, but didn't see Washu or Tenchi.
"TENCHI!" yelled Ryoko.
No answer.
"Help me!" yelled a tiny nude Kiyone.
"Why should I help a cop?" asked Ryoko, looking down at Kiyone. Then, Ryoko walked out of the lab. It was plain to see that Tenchi and Washu wasn't in the lab. But where else could they be? They could be in his bedroom, she supposed. But then, they could've gone out of the house to get away from Ayeka. Ayeka, meanwhile, was knocked out in the living room. So Tenchi wasn't with the prim princess.