Previous Bar and OnBar

I want to double check my assumptions:

When OnBar is executed:

1 - Bars.LastValue.Open = Bars.LastValue.High = Bars.LastValue.Low = Bars.LastValue.Close

The reason is that OnBar is executed on the new bar and the OHLC should be Bars.LastValue.Open

2 - To get immediately the bar that has just finished Bars.Last(1) will do.

Please confirm.