The language or translation seems to be holding something back here. If Ham only saw (caught a glimps), why does it say Noah knew what the younger son had done to him? There was some type of violation or deeper shame committed to warrant the severe curse that followed. In seeing it may be in how he saw and in telling it may be in how/what he told his brothers. Or else it may be something worse.
2012 - pBiblx2 Field Wise Bible System Version 2.0.9d - GPL3