[Website] Bard Reveal - Switching ability descriptions doesn't stop the video

When you watch an ability video while switching between the 5 ability descriptions (Passive/Q/W/E/R), the video doesn't stop playing even though it's in the background.

Steps to reproduce:

1. To go http://na.leagueoflegends.com/en/champion-reveal/bard-wandering-caretaker
2. Scroll to the Abilities section
3. Start playing the video
4. Switch to another ability.
5. Notice how the sound from the previous video is still playing.

Expected Result: The video stops when switching abilities. Actual Result: The video keeps playing in the background.

Tested on Chrome 40.0.2214.115 (64-bit). Mac OSX Yosemite 10.10.2.