According to the rules if you get a high negative modifier, i.e. higher than your skill value, you will get a negative value for your skill dice. A negative value for your skill dice is explained as you roll the negative number of skill dice and get "negative successes" for each success symbol you roll that reduce the number of successes you roll.
According to the rules if you get a high negative modifier, i.e. higher than your skill value, you will get a negative value for your skill dice. A negative value for your skill dice is explained as you roll the negative number of skill dice and get "negative successes" for each success symbol you roll that reduce the number of successes you roll.