The reason these True Immortals frowned was not due to the decisiveness of their enemy's execution; nor did they care about a Supreme Strong's allegiance. The definite elimination of an opponent wouldn't make them blink.
What drew their attention wasn't these superficial acts. For them, what did a mere Supreme Strong matter? Even if numerous Supreme Strongs died at the hands of Wan Fayi, it wouldn't come as a surprise.
After all, with Wan Fayi's identity and strength, he was definitely among the most powerful in the Myriad Laws trial, and his winning was not strange at all; conversely, his losing would be what shocked them.
For many True Immortals, their focus was not really on testing the strength of these True Immortals. While that might be part of their reason, it wasn't the whole nor the least important part.
They were keener to understand the characters and behavioral styles of these True Immortal Seeds.
