With a shake of his head Henri acknowledges and recognizes the group's decision. "Stay close, go slow, don't trust plants to be nice," he says in his characteristic terse, blunt manner, and begins leading the party deeper into the strange area. For his part, he keeps a watchful eye out for either assassin vines or the strange yellow flowers, intent on not being surprised should either reappear...

Spoiler: Mechanics
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Henri has Perception at +9 and will be moving at about half-speed (on top of his already slower than most speed of 20 ft per round). He's intent on not being surprised or ambushed without providing his group with an option to retreat...