No champion select alert background noise?!?!

So I was just in champion select for a ranked game and it was my turn to ban so I selected the champ I was about to ban and waited for a response from my team so I tabbed out real fast to look up some stuff for my game I was about to play and it literally didn't make any sound at all or even alert that my 10 secs to lock in was about to start. I ended up losing like 10 lp with a 30 min wait because that was my 2nd dodge since my 1st was from an impossible troll team comp. Really though Riot? No alert sound or ANYTHING for tabbing out?!?!?!