Willy had jumped up to get out of the way and Oliver was jostled forward from the bump, it was completely unexpected. Thankfully the person bumping into him didn't seem to be very big. Unfortunately it still managed to jostle his leg just so and he couldn't help the wince. When he looked up, he just offered the redhead a smile.
"It's okay, no harm done," he nodded, rubbing the back of his leg a minute to get the heating pad recharged.