TFT - Camille ult seems to have stunned dragon Shyvana instead of root

That's about it. My big beefy Shyv was fighting camille/jinx/gangplank, none of which have a stun. Only one of them had any items, I think a GA, definitely not a swordbreaker (nor was there that symbol). Anyway, Camille ulted her (a root) and shyv just stopped attacking for 4 seconds, despite obviously being in range.

Anyone seen that?