Although Su Ming probed him to the end, he still did not figure out what Thanos had returned to Titan for this time. But it definitely was not something as simple as visiting a grave.
Purple Sweet Potato had never been the easygoing type. His head was full of wild ideas about how to send people to Death, and he regarded Titan as his own territory.
That raised a question.
Why had Thanos stood outside staring blankly at the tombstone when Deathstroke left the hospital?
If he wanted to talk to Deathstroke, he could have waited at the hospital entrance, gone inside to find him, or stood anywhere else.
That meant he wanted Deathstroke to notice the tombstone while steering the conversation toward something completely unrelated to the true purpose of his visit.
Su Ming had played along at the time and enthusiastically discussed Thanos's mother.
Purple Sweet Potato had nearly lost his temper and attacked, but only for an instant. He immediately suppressed his anger.
Perhaps he thought Deathstroke, who had been staring at the tombstone, had not noticed that small fist-clenching gesture. But Strangle had always kept watch behind its host.
When he saw Deathstroke becoming more and more cheerful as they talked, Thanos forcibly changed the subject and brought up Magus Adam. On the surface, he was introducing an acquaintance from Earth, but in truth, he was cooling down the atmosphere while conveying another message—I have help too. If we fight, it will be two against two. You won't gain any advantage.
Su Ming had not wanted to fight them. By then, he had already seen through Thanos's intentions, so naturally, he took Wanda and left.
Once he understood those points, the rest became clear. Why had Thanos not made an issue of Deathstroke bringing someone here