Enemies that speed up

The following enemies speed up. They have some form of speed, boost, turbo, sprint, charge.
Enemy 	Speed boost turbo sprint charge
Rocket Rider 	Rocket Riders are the fastest flying enemies in Kingdom Rush, due to their turbo ability, which they use as soon as they take damage, and gives them a significant speed boost. Rocket Riders can be the most annoying and potentially dangerous enemies. Health-wise, they are relatively easy to take down, but one should beware their turbo boosts: they can zip past most towers, slipping through at the last second. Strategic planning and wise use of reinforcements is crucial.
razorboar 	Burning charge (80-120 damage), Bonus damage when hurt, Razorboars have high health and damage (which increases proportionally with health loss; up to double), good physical armor and the ability to charge through soldiers dealing 80-120 physical damage. They essentially force the player to use high-level magic towers or Forest Keepers (upgraded with Ancient Oak Spears), as archers and other barracks can't deal much damage while druids are only moderately effective. Razorboars are brutal to any setup that doesn't bother with enough funding for mages.
Nanoq warbear	Charges at soldiers, Nanoq Warbears are polar bears equipped with armor and trained by Northerners to charge into battle and attack enemies. They have high health and armor and their damage is also quite high, as they attack twice per cycle. While they initially move slowly, they have the ability to charge after a short while when not in combat, which greatly increases their speed (x2.1) and makes them very dangerous enemies.
leap dragon 	Limited Flying, Vikings mounted on dragons that can fly over enemies for a short time. (Cooldown: 5 seconds, duration: 2 seconds, speed factor: 1.8), Fat blue dragons with small wings mounted by minute Northerners, these are capable of "leaping" for short periods of time to avoid troops and artillery. Their health is average but they do sport medium armor, which makes magic towers more useful at dealing with them. Treat Leap Dragons as upgraded, armored Quarry Workers - except for the fact that archers and mages can still target them while flying. Oftentimes, they will appear in pairs, which makes them slightly less easy to block compared to Quarry Workers. When they change stances between flying and walking, incoming shots tend to be nullified and not connect with their targets.
cavalier 	Charges, Spawns a Paladin on death, Cavaliers are horse-mounted Paladins that can charge past troops at double speed to avoid being blocked. The horse that one's towers will attack has rather low HP and lacks any protection, but will spawn a full-HP Paladin once slain, which can be a problem if they manage to get past most of the player's defenses,