The rider seems badly injured, with several arrows protruding from his armour. He seems to still be breathing, but his skin is pallid, probably through lack of food or water. Taris runs up to the rider, and asks Draevous:

"Will he be OK?".

Another soldier runs towards the group, bearing some food, water and a healers' kit, while a third grabs onto the drake, and leads it out toward some kind of stable.

Lirril:
Spoiler
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The tube appears to be some sort of container for something - it seems to twist in order to open, although you aren't sure what it might contain. It bears the crest of Taris' legion - a dragon of some sort.