Modification to Guardian

I hard main support and I like the resolve tree, but I hardly ever take guardian, preferring aery instead if going that route. The reason I shy from guardian is it, more often than not, gets triggered when you don't need it, but also being on a lengthy timer d/t to potential power, and being triggered on proximity makes it an almost wasted mastery, at least in lane phase which can make or break games half the time depending on strategy.

My suggestion is to make it trigger like lifeline, at below 50%-30% health instead; taking proximity away would also help in procuring it for clutch moments instead of getting baited out without little effort or control over.