You were following Light to the Rooftop till you guys see L.

Light asks L.

"What are you doing there RYUZAKI?"

Ryuzaki Is L's alias so they call him Ryuzaki.

L couldnt hear Light so light repeats.

"What are you doing there Ryuzaki!!!"

Still,he couldnt hear Light so Light approaches him.

You follow light.

Light asks again

"What are you doing here Ryuzaki?"

He asked.

The two of them had a conversation.

You were behind Light.

As the two of them had a conversation..you caught a cold but..

The two of them don't know.

A while reached.

Their Conversation was finished.

"Let's go inside.*

Light says

The three of you go back inside and dry yourselves.

You changed clothes but you still had a cold and kept sneezing so you went to your room.

...

It's been a while since you were in your room so L looks for you together with Light.

The two of them split up to look for you.

...

L knocks on your room door.

"Y/N..?"