Blazes can hurt without throwing fireballs

A blaze hurted me without throwing a fireball. He pushed me in the lava without making me on fire and taked me 1/2 heart. It was in multiplayer

What I expected to happen was...:
I excepted that it would just put me on fire like usual.

What actually happened was...:
He hurted me without a fireball and pushed me in lava.

Steps to Reproduce:
1. Go in a fortress
2. Touch a blaze
3. See what just happened. ~

sry for my bad english