Sha Lin's basic attack an Planted Ability easily shred through his shield, and allows Sha Lin to easily kill Fernando. Additionally, with Wrecker, his shots deal even more damage, which easily melts Fernando's shield like butter.
Don't be afraid to get into Sha Lin's face as a Fernando in a 1v1 situation. Fernando's burn CC is not cancelled by Sha Lin's Withdraw, and with the Scorch legendary you can down him in no time.