Engage is a technique preformed by Dragons. It is a technique that when use between two Dragons that have strong feelings for each other, can maximize their power and allow them to fight off strong opponents.
Although Engage is supposed to be a Dragon technique, it has been demonstrated by Rose and Ryuji that it is possible to preform between a Dragon and a Human. However, it could be that this is only possible because Ryuji is a Breaker, and can chanel Rose's power through his Slash Breathe, and that regular humans who are not Breakers might not be able to preform an Engage with Dragons even when the conditions are met.
- Engage has never been seen used in its proper manner between two Dragons.