Ehhh...I wasn't gone. I was hibernating. [Or so he thinks.] You should've saved it for me, Shinji-kun.

[Since Shinji sounds frustrated (and only because of that), Panda finally unlocks the door. He still takes a second to do so, but yep. That's Shinji's voice. Maybe he was hibernating, too? A normal person would realize that they've made a mistake, but Panda's too unconcerned to bother correction or mentioning his journal communications. He said it once, why repeat it?]

Ahh...! It really is you, Shinji-kun! You're still here!