Sounds like hes getting sour on being stalled.

Also sounds like he needs a good ass kicking from another horse.

i've got a mean as sin plug ugly mustang that'll teach him some manners!

"Blessed are the flexible for they shall not get bent out of shape"
"You can discipline and Discourage or you can Discipline and Encourage"
"Gentle in what you do , But firm in how you do it"