R. Star wrote:
Probably because Krudge would've shot them if they delayed. The guy had already demonstrated that he was pretty trigger happy.
I think this is the right answer.
I see it like this.
Enterprise crew: "Spock we found you, we traveled far and broke the rules and fought Klingons to find you!"
Kruge beams down: "Get over there or else!"
Enterprise crew: "See ya Spock, gotta go!"
I think a pissed off, trigger happy Klingon trumps all niceties in any circumstances.