James Webb Space Telescope reaches launch pad for Christmas liftoff
The James Webb Space Telescope is due to launch on Saturday (Dec. 25) during a 32-minute window that opens at 7:20 a.m. EST (1220 GMT). The massive observatory will blast off from Kourou, French Guiana, atop an Ariane 5 rocket operated by European launch provider Arianespace. You can watch launch coverage live at Space.com beginning at 6 a.m. EST (1100 GMT) courtesy of NASA or you can watch directly at the agency's website.
ESA launch kit (PDF).
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You see that with pretty much any rocket launch with a camera showing stage separation. It's probably ice or something. It's not a Space Shuttle Columbia situation.
also the difference in speed between that last and all earlier stages that fell away instantly.