New Kitten runs up to resident cat and resident cat runs away

Hello all! I just recently adopted a new kitten (6 months/F). We already have a resident adult cat (m). We have been keeping them separated for a week and just installed a mesh door frame so they can see each other. My resident cat only hissed twice at the kitten and just sorta stares into the room where our kitten is at. This morning the kitten was in a playful mood and would run up to where the screen is and my resident cat would run away and then he come back, she would run away, and they would do that a couple of times. Is my resident cat scared of the kitten? should I go back to step one? Is this just their way of playing with each other?