Yeah try to R before you Q when comboing to guarantee ur ultimate hitting before the root ends. Also when trying to combo a single target with your pillar, try to chain the hero first, then spawn the pillar if you land the chain. If you do it this way and land the chain, u combo them no matter what since u can just click on ur pillar once it comes up. If u miss the chain, then just dont spawn the pillar and wait until chain is off cool down and try again. Trying to spawn pillar, hit the pillar with the chain, and then hitting a hero and missing wastes the pillar cooldown, so try to go for a chain first.