Guild Wars 2

Ello, self proclaimed abnormal thief; xia here lol
This time its about the weapon sigils, being that i am a survivalist/support thief i was hoping to get some info/feedback on some sigils.
1. Sigil of water; 30% chance to heal allies.
Q; How exactly does this work? Does it heal myself as well as my allies when it does proc, where does it proc? Say i shoot someone with my SB if the sigil procs will the aoe heal happen on my char, or on/around the enemy that was hit with the proc’d arrow, i was told i could use SB’s clusterbomb move sorta like an aoe heal pump ala Cluster+healing field without the need of the healing field if i use this sigil But im unsure of how to test it and its general functions.
2. How much is the heal worth? Does it scale with your healing power? or is it a negligable base amount.

Now onto the next topic i need some assistance on, Runes.
My chars defensive/survival stats are as follows; 2.7k armor rating, 17k health 900 healing power.
When it comes to runes im extremely torn about what to get, im not sure if i should beef up my toughness more or go more towards vitality or maybeh go 50/50 on them
or maybe just put them into something offensive so im more well rounded, id appreciate your thoughts/input. [sorry about the semi wall of txt]

I dont know anything about sigil of water, but I would be willing to bet the heal it gives is extremely small.

As far as being a support thief, our profession unfortunately just isnt very good at healing others. Our best support is putting our team into stealth, thus removing aggro from them, this is great for ressing people. I spend a lot of time ressing my teammates, so if you are focused on making a healing/support set of armor, I would use runes of Mercy, which give boosts to reviving people. Another solid rune option for healing is Monk, or you can just use orbs for stats of your choice.

The heal is around 300 HP every 10s. Not much tbh.
Then again lots of sigils need a decent crit chance to be worth using and sigil of water might be among the few viable options left for your build.
I don’t know if those stats are form PvP or WvW and I don’t know your weapon sets/source of dmg either.
There are quite some good combinations that are more defensively. Lyssa runes synergize really well with our low CD heals+Daggerstorm/Basilisk Venom. They some minor Precision to slightly increase crit rate to a decent level to make 10s crit proc sigils worth a try. Sigil of Purity is pretty good if you play defensively. (60% to remove a condition on crit – 10s CD)
Since you build around survivability a stacking sigil such as bloodlust or whatsoever is mendatory.
If you wanna use 2x the same weapon set (e.g. 2x shortbow) consider proc on weapon switch sigils. Geomancy is pretty nice to apply 3 AoE bleeds for 7s. Those sigils break stealth on proc though.

Sigil of water is just crap, end of the story my friend.