Sejuani's Boar

So I was playing a game of league last night and the enemy team had a sejuani. And early game I noticed when ever I went near sejuani, her boar would make constant growls and snorts and I thought maybe sejuani is spaming a joke or something but then in mid game when I was around her and she died and the boar kept squealing and such after death I knew she wasn't doing It. Also my friends told me even if they were dead by sejuani/ dead sejuani and no one had vision on her they could still hear the boar. Is this a sound bug since the new patch or is it just random?