NightDragon 2 wrote:What advantage does sidestep have over Fend?
Blocking at the highest level is all about positioning and control. The idea behind both Fend and Side Step (and also Stand Firm) is they take away control from the blocker. If you read the Art of Blocking, it is all about where to push to and when to follow up. Of the three, Side Step gives the blockee the most control.
Fend is primarily a mobility/defensive skill, with positional considerations a secondary benefit. One of the main benefits of Fend is that it provides mobility to average/low agility players. And increased survivability to the AV7 ones.
Side Step is primarily a positional skill with secondary defensive considerations. Any player who can take Side Step on a normal skill pick starts with either agility 4 or Dodge (the Norse Runner being a notable exception), and mobility is not usually a problem for such types. If you're marking an Elf it is usually because that Elf wants to be marking
you and Side Step makes him/her doubly sticky! Thus Side Steppers tend to be markers and will have Dodge as their primary mobility/defensive skill.
So they are not totally a like for like comparison in the same way Side Step and Stand Firm are. The comparison is usually Fend versus Dodge, and Dodge wins nearly every time. This is why Fend is recommended as a Skill for general access only pieces. And sometimes Throwers who lack agility access. Orc Throwers, Dwarf Runners, Thro-Ras, etc.
Other benefits of Side Step are:
It's very hard to crowd surf a Side Stepper. Great for defending side lines.
Harder to punch a hole through a Side Stepper screen
They make great markers, especially of cage corners.
Less hits on the LOS, a smart coach will block Fenders diagonally
Chain pushing to set up one turners
I'm sure Matt can think of tons more (I heard a rumour he's got a petition going to change the law, making it legal to marry a game concept!

)
Getting back on topic, on a double you might say Dodge or Side Step is better than Fend on a Norse Lineman but you really need to get as much Guard as you can. My build plan for Norse Runners is Dodge, Side Step, with Fend as a late skill if I want to be thematic.