Tip
Even if you were pulled in by (E), continue to deal damage while retreating with [W] when his (P) activates. After reaching level 6, you can defeat him even when he uses (R).
Tryndamere vs Mordekaiser

Even if you were pulled in by (E), continue to deal damage while retreating with [W] when his (P) activates. After reaching level 6, you can defeat him even when he uses (R).