By response, we typically mean some form of behavior involving muscle or gland movement. Bleeding is not a collateral response, but it is a public accompaniment. Looking pale is also not a collateral response, although the act of paling could be considered a collateral response that has looking pale as a response-product.
A way in which the verbal community brings verbal behavior under the control of private stimuli that has the following features:
A private stimulus
Some collateral behavior
The community’s reinforcement is contingent upon the presence of the collateral response
The type of private stimulus
The form of the collateral behavior