To my defender titan brethern
Use armor of light with unstoppable in crucible for your bubble. You're nearly invincible inside of it, including oncoming bladedancers. If one is coming, time your fusion rifle right a they are about to enter. After firing, immediately punch and he should go down, next to no harm to you.
While Im at it, try putting your bubble [i]near[/i] a capture point of the enemy, not on it. This tempts nearly all players to want to come wreck your shit. Just stay inside and melee everything/heavy machine gun everything and you should come out on top.
If a warlock comes by with his void super, back out of the bubble and sometimes it wont smash you. Same for strikers except back out and glide at the same time. Golden guns are a bit more tricky, I usually have a machine gun on sights for when they're about to pop my bubble and attempt to kill him first. Staying mobile insde the bubble helps.
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What also helps is if you have Helm of the Saint with blessings of light for your teammates. I love running defender with those perks. I usually put up a bubble near a control point (normally near B), run off to our other control point and keeping the enemy from taking it. Everyone usually goes for B and when they charge blindly into it, they in turn are blinded and therefore are vulnerable. Throws the enemy off a bit and it's those seconds of confusion that tend to keep my teammates alive (plus the overcharge helps). Just saying.