Activated charcoal is for the purpose of drawing toxins to itself - I know of no reason it would be help for a bruise or 'trauma' injury (except indirectly, by assisting the body to be a less toxic condition).
Adding activated charcoal to the IF#2 is different that using an activated charcoal poultice over a specific organ (or smaller area on the body) to draw out toxins. When adding more to the IF#2, it provides a 'overall general' pulling of toxins out of the body/bloodstream and into the digestive tract for elimination. When used as a poultice it pulls from the organ/area under which the poultice is applied. By the way, a very small activated charcoal poultice is fantastic for insect bites/stings (as is Bentonite clay - which can be applied directly). If one applies activated charcoal directly to a break in the skin, it can leave a 'tattoo'.
Castor oil is the immediate 'go to' for bruises, strains, sprains and general 'aches & pains' :) Add hot/cold contrast therapy, Deep Tissue Repair Oil and/or BF&C oil (and/or internally)...and you've got yourself a healing :)