you and Leon were friends and tonight Sayaka Maizono told him to meet him in her room... You had a sneaky suspicious that she'd try to kill him

"I wonder what Maizono wants..."

he didn't seem to have the slightest idea what would happen to him once he went to Sayaka but you knew exactly what'd happen to him

"Hmmm... Wanna come with me?"

after you agreed and went to Sayaka's room both of you didn't know she's in the bathroom with a knife ready to kill you both

"Sayaka? You here?"