Kurt immediately switched his assault rifle from single shot to burst fire at the sign of the eggs. He was, unsure of the creature that laid them, but anything large enough to make an egg that big was certainly trouble. He kept his weapon trained on the eggs as he moved to what slight amount of cover there was, not that it likely mattered by something to hold was better than nothing. Kurt saw their twitching and had to restrain himself from shooting the mutated creatures that dwelt within the shells, they were abominations and surely ones that were hostile at that.

Kurt checked the angles once more, the tunnel wasn't the best fighting position but it would have to work if all else was poorly. He made a gesture to those around to try and seek out some sort of cover, at least until the eggs stopped moving or their...creator, came to visit, for the worst. 

Kurt was grimacing under his gas mask now, though to the exterior observer it could well look like a begrudged, perhaps almost even joyous smiling at the circumstances. At least they knew what to shoot at now.