Interesting... In that case, it will encourage players to hold back on playing pillars so that they may be hurled one at a time...
I could just see a grav bow now that uses pendulums of every color in addition to quantum pillars so that it can play and hurl them with wild abandon and not have to worry about them stacking... 6 damage for 2
and a free pendulum isn't too bad I guess... or maybe 2
and 1
if you use an hourglass to speed up the hurling process.
Not sure if I'm entirely enthusiastic about that (since i would think a big stack should do a little extra damage compared to a small one) but it will be amusing to watch at least.
*... Sir We only have 3 hitpoints left and these stupid giants... wait I know... THROW EVERYTHING WE GOT AT EM... and I do mean EVERYTHING*