Because he's SHY.
Vikings Season 1, Episode 1
When they stop being SHY, they get angry.
Game of Thrones Season 3, Episode 1
Of course you can. You're SHY.
Game of Thrones Season 5, Episode 3
Be a little SHY.
The Big Bang Theory Season 2, Episode 22
"Shy...
-Shy.
Money Heist Season 1, Episode 6