Lolol. Not all warthogs...... It may have warned him previously... As you must know, animals will only usually only attack after trying to tell you, that you're being irritating, And attack if you don't stop, much like humans do & like this story where the cheetah almost attacked her dad
 "Birthday surprise turned out to be a shock.... cheetah Gerda attacked sasha...."
https://youtu.be/YZSbYYzODAI?si=aMfCUeqk_kh9h53u