Nautilus vs Nami

Aim Dredge Line (Q) at their carry: you and your target are pulled toward each other, and they're briefly stunned.

After Dredge Line (Q), land an auto right away: Staggering Blow (passive) roots the target after the stun, giving your ADC time to arrive.

In teamfights, hit a new target whenever you can: your first auto on each target triggers Staggering Blow (passive) and briefly roots them.

Cast Depth Charge (R) on their backline carry: every enemy the shockwave crosses along the way also takes a knock-up and a stun.

Change direction when she casts Aqua Prison (Q), then step up if she misses: it's her only stun outside her ult, on a 12 to 8 second cooldown.

Avoid trading when she casts Tidecaller's Blessing (E) on her ally: their next autos and abilities slow you and deal more damage.

Step out to the side of Tidal Wave (R): it travels a long way but moves slowly, and its slow lasts longer the more distance it has covered.

If you can engage, target Nami when she steps up: with no dash or leap, she can only walk away.