“ having two breast-bulges on a solid breastplate would create a concave channel just over the wearer’s breastbone. Most blows that strike the breast-bulges on the inner halves […] would naturally get deflected into this channel. This becomes a serious problem when the armor has to deal with a powerful upwards thrust; the presence of the channel would tend to direct the thrust towards the middle of the chest and up beneath whatever throat protection the wearer had at the time.
