My pony randomly swings her hindquarters out?

When she's tied up, and people are going along with their stable duties (walking behind her) out of the blue she swings her hindquarters right out AS IF she's threatening to kick but by all means she isn't. Her ears are perked and she's too busy eating to worry about what's going on behind her, she has never kicked or swung her hindquarters out in threat.
But it scares people and I always wonder why she does it so suddenly for nothing o_O.
When she does she's also a pain to move back by the wall.

Pretty pointless question but I haven't asked one in aaages.
 
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