Three things from the finale:
1. To "splice" is to join two or more things together - like splicing electrical wires to complete a circuit. What Savitar wanted would have been more like an interdimensional quantum splinterer, or fracturer, and not a splicer.
2. On Cisco's request for Wally to "reverse the polarity on the neutron flow": neutrons are neither positively nor negatively charged, so a "neutron flow" would have no polarity.
3. If we've learned anything about the Arrowverse, the deaths of H.R., Eddie, and Barry's mother show us that Arrowverse citizens with massive heart trauma will bleed out at the speed of plot, with plenty of time for a conversation along the way. :/