Vanguard + Poor man's shield

[Cl3arSky]

do they stack in anyway shape or form?

[Ninjabutter]

http://dota2.gamepedia.com/Damage_Block

"Only one instance of Damage Block can proc at a time. When multiple sources of damage block are present, the source with the highest possible damage reduction is checked first, and only if it does not proc will any others roll. In other words, when two sources of Damage Block have the same chance to proc, the one that blocks more damage will take priority. While the damage from multiple damage block sources do not stack, the % chance stacks multiplicatively. Such as, having two stout shields, the chance of blocking damage becomes (60 + 60*0.4)%, effectively having a 84% chance to block 20/10 damage."

Since PMS is a 100% hero block rate, Vanguard's block would never proc.

Edit: For heroes, anyway. Vanguard could still proc for damage from other sources, of course.

[Cl3arSky]

what does "proc" mean?

[Weird Grim]

easy the highest item will count and its like 80%(to block 40/20) if the hit get past it goes to the 60%(to block 40/20 becoase the highest count)