I've never tried it since I favor shoulder charge, but if it's anything like shoulder charge, then the charge up time should be 3 seconds from the time you start sprinting, if you notice enemies are around the corner, then do what I usually do, just look at the wall in front of you and start sprinting at it til you get the shield up, then head towards the enemy. Beats having to time the charge up when trying to rush an enemy.
I keep thinking it would've been better to have Juggernaut be part of shoulder charge, you see the shield pop up in front of an enemy Titan, then you would know your in for a bad day unless you have enough firepower to stop them. Would also help the problem with shoulder charge not always working since alot of times you will hit an enemy with it, but your the one who gets taken out by their shotgun.
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Great points, I agree they should be part of each other. And yea I've done the same thing with the running at the wall thing, but in the end shoulder charge just seems like a better option if you're trying to one shot them anyway.