We now have evidence of sorts - that the chance of Monet being alive won't feel like a Pell moment.
Here. I cleaned up the actual "heart stabbing" by taking away some of the excess shading.
In the second panel, you can see the distorted shadow of the spike through the blood cube. (Distorted like an object underwater) if it actually hit her heart, that silhouette wouldn't be there, it would just be embedded. Then look at the angle of Ceaser's hand. (I added a couple defining lines to make it more clear.) Rather than being directly above and stabbing downward, in both panels its stabbing at more of a 45 degree angle.
It missed entirely, and at most, grazed the side. You can see the spike on the edge of the heart even in the actual drawing.