The reason why Garran decided to help Cain was because his intuition told him to do so, and he thought that Cain must have some trump cards since Cain had never shown any fear, as he also didn't think that Cain would be bluffing at this point.
When everyone heard it, they were surprised since no one had expected that Garran wanted to help Cain despite knowing the current situation was very bad to begin with.
Even Butler Zen was taken aback since he didn't expect that Garran was willing to go this far for someone he had just met. He then asked him since this matter wasn't something trivial that could be decided randomly.
"Young Master Garran, are you sure?" Butler Zen asked as he glanced at Garran with a serious expression.
Garran only chuckled at the stupid question Butler Zen had asked him. "Of course. Did you not hear what I just said?"
Sigh!