In an interview, scriptwriter Shotaro Suga suggests that Leon and Ada had an off-screen romantic encounter while Resident Evil 5 was ongoing, more accurate, he did said something about: “Romantic Dinner/Hotel/motel room night”; there was not enough time in the movie to explore their relationship as Shotaro had planned, so he left a “open window” for the fans to “interpretate it as they want” but he did confirmed that it was somewhere around RE5, and that the line was not a reference to any past games.
Chris is just saying and doin’ what i felt like doing during the new Teaser. Leon almost got bitten 5 TIMES in LESS than 20 seconds, while Chris backed off from the Zombies Leon just allowed himself get cornered and surrounded with only a simple handgun.
LEON! WHEN YOU SEE A ZOMBIE HORDE YOU RUN!!!!!!!!!!!!