Strange voices on Summoners Rift?? Edit: They're Warding voices

https://www.youtube.com/watch?v=p9QdEzBq5vM

^^^^Am I dumb? Have I missed something or has anyone else heard this?^^^^

Edit: Its Cassiopeia and Sion, I can hear their voices when they ward (I think), even when they are on the other side of the map.

So I was playing an URF match and while playing I kept hearing a female voice say "watch and wait" followed by another line I can't make out...something like "trust us" maybe... I heard it a couple of times and usually when I'd hide in a bush. Sorry the audio is is bad, I had my mic on, but around 15 seconds you can hear her voice...the one saying "WTF" is me (sorry). In the second clip however, my mic is off and you can hear another voice a bit more clearly. There's a masculine voice saying something else. I can't make out the first part... "let them seek little ???? let them die" and then "a trap for vermin"

Just wanted to share, I have no idea what any of it means. At first I thought it was the voices of other champions I was playing with, but looking back on the games the voices don't match with any of my teams or the enemy teams' champs.

The voices match the champs that were on my team, DERP.