When does Combat Agility's effect occur when it is triggered by movement?

[Zaran]

Until a dex fighter has enough dex to shift 5+ spaces this power is useless next to Superiority since even with no wisdom the fighter can stop movement as part of their op attack.

 

[Wednesday Boy]

If that Dex Fighter takes Grappling Strike (an at-will that grabs and can be used in place of a MBA on OAs) it can halt someone in place too.

It seems like a Grappling Strike Fighter can more effectively stop someone than a Combat Superiority Fighter because someone stopped by Grappling Strike will need to spend their other move action to escape the grab whereas someone stopped by Combat Superiority can simply move again.

 

[Ferghis]

I'm not sure what you're getting at but my interpretation is that because the range on Combat Agility is "Melee weapon" after the enemy moves and you shift, the enemy must be within "melee weapon" to make the "Hit: 1[W] + Strength modifier damage, and you knock the target prone." attack. i.e., if the enemy is one square away after your shift and you don't have a reach weapon you don't get to make the attack.

That's correct.

 

[OnlineDM]

Until a dex fighter has enough dex to shift 5+ spaces this power is useless next to Superiority since even with no wisdom the fighter can stop movement as part of their op attack.

I agree that Combat Superiority tends to be the better choice, yes. But if a player, for whatever reason, cares more about having the option to shift toward a bad guy (even giving up the melee basic attack to do so) and less about being able to stop their movement, well this gives them that option. It's not an option I'd personally want, but who knows? Maybe someone out there really likes it.

 

[Colmarr]

Nevermind

 

[UngeheuerLich]

I agree that Combat Superiority tends to be the better choice, yes. But if a player, for whatever reason, cares more about having the option to shift toward a bad guy (even giving up the melee basic attack to do so) and less about being able to stop their movement, well this gives them that option. It's not an option I'd personally want, but who knows? Maybe someone out there really likes it.

Tricky question...

If you are a high dex fighter and your main job is not pure defending (like a tempest fighter), you ar not that worried about someone leaving your vicinity. You rather like to stay adjacent to an enemy and maybe follow him back to your main defender or other striker.
Also you should note, that you need to hit with combat superiority to stay adjacent. With combat agility you sta adjacent, even if you missed after the shift.
You can also chose to shift some squares with the monster, but stay out of melee, which could come in handy in some rare cases... (a zone that would damage you at the start of your turn...)

 

[Nullzone]

This is why I dislike Fighters, their mechanics always seem at odds to me.