Boarlaming de-agression issue

Tested on HD.

I tried to lame a boar the exact same way as 500 times before with a normal scout, played as turks. I hit the boar twice, the boar hit me twice. It started hunting my scout for like half a second but then it instantly lost aggression and i never saw that before. Played on HC2 Arabia. Am i missing something essential here or does that happen because of the HC2 map script? Tell me please, it kinda messed up my game plan and i feel like thats not normal ^^