One of Potemkin's more interesting moves, Slide Head has two different attacks during its active frames. The first is Potemkin's actual body itself, a level 5 attack that hits low, but that's likely not what you're using it for. If the first attack misses, the second attack occurs, which sends out an unblockable shockwave, covering about 3/4 of the screen at full zoom-out, which can be avoided only by being in the air (jumping, Dizzy/I-No dash, backdash, feet/lower body invul attacks, etc.). If this connects, it knocks the opponent down, and keeps them there for an extra 40 frames over normal knockdown length, giving Potemkin time to advance.
When going for a knockdown with Slide Head, make sure you're not too close. If the first attack connects, the knockdown attack won't come out. Additionally, you should always be holding back after performing a Slide Head so that you can charge a Hammer Fall, then Break to get in and set up oki. Slide Head's startup animation has upper body invincibility, but it won't usually help against jump-ins.
1~16F Above knees invul. 25~38F Low profile. Knocks down opponent on ground hit. Quake has 29F startup and is unblockable. Can not be RC’d.