Rell vs Nami

Engage with Ferromancy: Crash Down (W), which knocks enemies into the air where you land and shields you until you remount.

Save Shattering Strike (Q) for a shielded target: the strike breaks all their shields and stuns every unit in the line.

Cast Magnet Storm (R) in the middle of them, then Ferromancy: Crash Down (W) on top of them, so the enemies you just pulled in take a knock-up.

Cast Full Tilt (E) on the ally engaging with you: you both gain move speed, doubled toward enemies, and your next auto explodes.

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.