DragginMath: Flick/Double-Tap for Red Mode (Advanced)

Here are some other things you can do with flicks and double-taps:

DragginMath: Double-Tap to Replace

DragginMath: Flick Left to Copy or Delete
DragginMath: Flick Right to Inject
DragginMath: Flick Down to Expand ⓟ ⓒ