Sensei Nishiyama used to tell us that often when we spar: "Once you go, give everything, don't stop till finish".
I think that because we focus so much on finishing technique (todome), karate people have tendency to stop after one technique, but it is not always possible to catch the opponent with one action.
Sometimes I will do one technique to close the distance without giving space for counter, in order to make the right distance for finish technique, and sometimes I will execute the first technique to create reaction from the opponent, and to open the door for finish technique using his reaction to my first attack.
Here I am mostly referring to the case that you have the intention to make todome (finish technique), you give everything and either miss or the opponent blocks or shift. The fact that you give everything, should not limit your ability to transition smoothly and powerfully to next technique, on the contrary, because you give everything mentally, your mind should be empty and therefore free to smoothly, without delay, without recalculation, make next action as reaction to the opponent’s reaction to you.
Because you give everything physically, you have more pressure to floor, and the reaction of this pressure plus the momentum from previous technique, should be used to next technique, that is if you don’t cut the breath and momentum.
Point is don’t recalculate between techniques, you will miss the chance; use your breath to make adjustments once you start your attack, not your brain.
Many times we miss the first attack and the opponent is still behind rhythm, if we stop, or make extra action between, or recalculate, the opponent will recover and maybe even have space for counterattack.
We should know to distinguish between times that we must continue attack, or if the chance is not big enough, keep the pressure on the opponent to create chance, or if we are in same rhythm with opponent just keep Zanshin to not give chance for opponent counter.
Once you go, give everything (Ho shin), don’t stop until finish.