Lee Sin vs Trundle

For the Insec, land Sonic Wave (Q), reach the target, ward behind them and jump to it with Safeguard (W): Dragon's Rage (R) kicks them toward your team.

Wait until your target has lost health before casting Resonating Strike (Q): its damage scales with missing health, and you have 3 seconds to cast it.

Cast Safeguard (W) on an ally, minions included, or on a ward to dodge or escape: it has a 7-second cooldown and also shields the targeted allied champion.

Look for invades, ganks and objectives early on: Lee Sin is strongest early, and his impact drops once the others have their items.

Don't fight in Frozen Domain (W): he gains move speed, attack speed and increased healing inside. Back off to draw him out of the zone.

If you deal physical damage, back off after his Chomp (Q): it steals some of your attack damage for a few seconds, and he gains it.

Get away from Pillar of Ice (E) as fast as you can: it slows nearby enemies and blocks the path while it stands.

Back off when he casts Subjugate (R) on you: he steals part of your armor and magic resist, and gains what you lose.