That was when the horses panicked completely, and bolted, bucking and kicking.

The horses panicked, tried to turn away.

The Castiles were unable to regroup, and the horses panicked.

When the alarm had been tested, the horses had all panicked.

It must be as the Sister said; horses would have panicked had it been real lightning.

If the horse panicked, she had good reason.

Taken completely by surprise, both men and horses panicked and were routed.

The horse panicked, the riders fell off and the woman complained to the local police.

Then one foot slipped, and the horse panicked.

It seems that horses panicked and riders were thrown while some members of the crowd were rode over.