No idea about the runes on the wall, probably hypnagogic imagery superposed to your real-world sight.
About the motorcycle, and TV: were they real and did you still hear them after ? Be aware that hypnagogic sounds may be very similar to the real word ones. Many times when doing WILDs, and just entering the "interesting phase", I heard people call me, neighbours banging on the wall, or my radio turning on, thinking "Oh no, not now !" but that was just HS; so do NOT give up to answer the phone if it's ringing, it's probably a trap !
And finally, the "body in water" sensation : you were very close; it's exactly what I have in the transition when entering the proper LD from a WILD. Just observe it, let your "body" move (don't be afraid if you feel like falling from your bed, like the HS it's not real). For me, it lasts maybe 10 seconds, then I see my dream bedroom, and bam! I'm in the LD.