As you start backing away the one on the left starts approaching the fallen branch. Keeping out of his way you watch him turn back to the group and yell out. With a shrug he begins to converse with them.

Keeping an eye on the rest of the group and you see the one to the right rummaging through his pack, pulling out a small vial.

---OoC---
It's only been at most 5 rounds since you cast invisibility, so you still have around 6-1/2 minutes left.