I always like to imagine Yuuno as a resourceful support mage who does not rely on using offensive magic to win fights.
*Yuuno binds an enemy*
Enemy: "You can't defeat me with these binds!"
Yuuno: "No, but she can."
*Yuuno teleports a
charging-up Nanoha in*
Nanoha: "-IIIINE~"
Enemy: "YOU CHEATER!"
Yuuno: "
Nyeh!"
Nanoha: "BUSTER!!!!"
Cheers.