Break Speed 
To use this event use the following import:
groovy
import net.minecraftforge.event.entity.player.PlayerEvent.BreakSpeedSub-Classes 
This event extends the following events and can use all their methods and fields: 
PlayerEvent, LivingEvent, EntityEvent
Methods 
groovy
net.minecraft.block.state.IBlockState getState()groovy
net.minecraft.util.math.BlockPos getPos()groovy
float getNewSpeed()groovy
void setNewSpeed(float arg0)groovy
float getOriginalSpeed()