That seems to be a problem with the Dynam ESC it cuts off the the motor if it overheats OR the battery is low. On mine there Idea of a slow down is more like turn the switch off!
First and last Dynam I will run. Back to a RC Exceed next time as they have more programing features.
If the motor is turned off on the ESC you still have power to the servos to control the landing...somewhat.
Bec on most of these small ESC are at about 5.1 volt and can handel 5 servos (king has 4 and a gyro that counts as one also so a total of 5)