Charging Yashiro for attempted murder can mean one of 3 things:

1) attempted murder of surgery girl via IV
2) attempted murder of Satoru via dropping him
3) All of the above.

Quote Originally Posted by Shinta
After Satoru fell, he can just say to one of his allies to stop the operation because of the tainted IV drip. The time on his phone when the teacher showed him Kumi's message was 15:42, while the IV drip is supposed to go off at 16:30. There was easily enough time to do that.
Saving IV girl doesn't change the fact that there was muscle relaxant in there, with Satoru's fingerprints all over it. Where's the evidence to point it towards Yashiro instead?

Quote Originally Posted by shinta
The teacher was holding onto the wheelchair with one hand because he was grabbing onto the rooftop railing to prevent himself from falling too.
Exactly. Holding onto Satoru with one hand only gives a perfect explanation for why Yashiro ultimately "lost his grip" and let Satoru fall. He was even then so grief stricken that he tried to commit suicide afterwards.

Note that holding onto just a single wheel while maintaining both wheels balanced on the ledge is pretty dodge physics, hence my previous comment. He's not even supposed to be able to save Satoru, let alone be charged for "attempted murder" for deliberately dropping him.

None of this can convincingly put Yashiro behind bars.