Gameplay Bug

I was playing as Dragonslayer Jarvan on SR purple side, I was jungling and had typical runes and masteries and started with hunters machete. My team consists of Kennen, Talon, J4, Jinx, and bard. The enemy team consists of Vlad, Naut, Jinx, Zyra, and Eve. While playing as j4 i started at Krugs and noticed that Jarvan had no attack animation. The typical noises would be the same and the minions would take damage but visually J4 just stood there making noises while the monsters took damage. I have not been able to replicate this bug again but i also have not had an instance where the team composition was exactly the same. While this is only a visual bug it is still a little off putting and made gameplay a little hard.