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The the orc isn't Large then? Added the aditional +4 to Trip to my first post (and specifically mentionned the extra attack on a successful Trip from the Improved Trip Feat).
Re cover, the others can always delay next round while Ur either shrinks or - preferred - kicks the orc mage back into the lab with his Knock Back power. As it is Tutek already provides cover to him. Anyways, that's what Ur does this round. Let's move forward, shall we?
Quick recap: An orc mage has appeared down a 100' corridor leading to some sort of lab, Darrian teleported Tutek 20' away from the orc (giving him cover from the group's ranged attacks, by the way), Ur delays until after Tutek, you're up. Actions described but not yet happened: Tutek attacks, Ur charges and attacks.
Gerard hears the commotion and hustles to the hall, then sees the orc that his companions are attacking and does not second guess their actions. he starts with a simple spell. he speaks words of power and 5 missiles of force shoot out from his hand.