It would be much the same with the mare which does not show strong signs of estrus. She could easily be lost in the shuffle, with her mild signs of estrus going undetected. Here an individual teaser is allowed to approach an individual mare. The normal procedure is to allow the pair to approach nose to nose, with the stallion then allowed to nuzzle and sniff other parts of the mare's anatomy. If this is done without a restraining wall between the two, it can pose a danger to the handlers and to the teaser.
Some mares are violent in their rejection of a stallion when in diestrus.
They will strike, bite, and kick. Teasing over a wood barrier reduces the risk of injury to all involved. When moderate to large numbers of mares must be teased, it is probably most efficient to utilize a system in which minimum handling is required. Such methods might include a group-teasing paddock with a cage for the stallion, or a long chute for mares to pass through while the stallion is led alongside. Both methods are relatively safe for mares, stallions, and handlers.