I agree with your comment. That is the normal way offering are done. First you release a very positive press release into the market, this is normally done before the market open. That time period will have the biggest effect on the share price in setting it open for the opening market. later follow by share offerings, but this really work when the pps is release during pre market hours, not 1 or 2 hours before the market closes.
Things could be looking really good for next week.
the S-3 gives them the authority thus the possibility to raise cash for the trials
It seems logical to me that at least part of this new shelf agreement would indeed relate to "the possibility to raise cash for the trials". Specifically, It seems that NWBO recently indicated that they could keep their funding needs at a low level, until such time as it became imminent for the combo trials to commence, at which time they would need to do aggressive fund raising. Perhaps this new shelf filing relates this? Perhaps BP will pick up a good part of the tab, but perhaps NWBO will still need to come up with a big chunk too?