"Nope! You're the one used to checking places out! Maybe you'll see what I miss or something."

So, once Phoenix is healed up and on his feet, he gets a message from Sonic telling him to meet him at a certain hallway in a certain building. Once he gets there he'll find that yes, it's the same building he got rescued in.

"Hey buddy! You feeling good enough? Then let's do this!"

It won't take long for him to lead Phoenix to the hidden room. Hopefully it hadn't been disturbed too much since it was found.